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((13)C5,(15)N)-valine 
(+)-(1S,2S)-norcoronamic acid 
(-)-monascumic acid 
(-)-syn-2-isobutyl-4-methylazetidine-2,4-dicarboxylic acid 
(1S)-isoindoline-1-carboxylic acid 
(2R)-2-amino-3-phosphonopropanoic acid 
(2R*,6S*)-2,6-diamino-3xi-hydroxyheptanedioic acid 
(2s)-2-Amino-4-sulfinobutanoic acid 
(2S)-2-Amino-8-hydroxyoctanoic acid 
(2S)-3-(3-Carbamoyloxiranylcarbonylamino)-2-aminopropanoic acid 
(3S)-3-hydroxy-L-ornithine 
(4R)-2-methyl-1,3-thiazolidine-2,4-dicarboxylic acid 
(5S)-5-amino-6-hydroxy-2,6-dioxohexane-1-diazonium 
(E)-2-[(2S)-2-Amino-2-carboxyethoxy]-2-hydroxyethenediazonium 
(E)-2-Butenyl-4-methyl-threonine 
(R)-AMAA 
(S)-2-Amino-2-(1-methylcyclopropyl)acetic acid hydrochloride 
(S)-ACPA 
(S)-alpha-methyl-4-carboxyphenylglycine  
(S)-AMPA  
(S)-cis-2-Amino-5-chloro-4-pentenoic acid 
(S)-F-Willardiine 
(S)-Homostachydrine 
1-AMINOCYCLOBUTANE CARBOXYLIC ACID 
1-aminocyclopentanecarboxylic acid 
1-aminocyclopropanecarboxylic acid +  
1-methylhistidine 
1-methyltryptophan  
1-propanoylproline 
2,2-dialkylglycine +  
2,4,6-trimethylphenylalanine +  
2,4-diaminobutyric acid +   
2,4-diaminopentanoic acid +  
2,5-diaminohexanoic acid 
2,6-diamino-7-hydroxy-azelaic acid 
2-[(L-Alanin-3-ylcarbamoyl)methyl]-2-hydroxybutanedioate 
2-amino-2-hydroxybutanoic acid 
2-amino-2-methylbutanoic acid 
2-amino-3-(2-methylenecyclopropyl)propanoic acid +  
2-amino-3-(3-oxoprop-1-enyl)but-2-enedioic acid +  
2-amino-3-cyclopropyl-butanoic acid 
2-amino-3-oxo-4-(phosphonooxy)butanoic acid +  
2-amino-3-oxobutanoic acid +  
2-amino-3-phosphonopropanoic acid 
2-amino-4-(S-butylsulfonimidoyl)butanoic acid +   
2-Amino-4-[(2-hydroxy-1-oxopropyl)amino]butanoic acid 
2-amino-4-[hydroxy(methyl)phosphoryl]butanoic acid +   
2-amino-4-formylaminooxy-but-3E-enoic acid 
2-amino-4-oxopentanoic acid +  
2-amino-5-chloro-cis,cis-muconic 6-semialdehyde 
2-Amino-5-methyl-5-hexencarbonsaeure 
2-amino-5-oxohexanoic acid 
2-amino-5-phosphonopentanoic acid  
2-Amino-9,10-epoxy-8-oxodecanoic acid 
2-aminoacrylic acid +  
2-aminoadipic acid +  
2-aminobut-2-enoic acid 
2-aminoheptanoic acid +  
2-aminohexanoic acid +  
2-aminomuconic acid +  
2-aminopentanoic acid +   
2-aminopimelic acid +  
2-fluorophenylalanine +  
2-hydroxyphenylalanine +  
2-ureidoglycine +  
3-(Allylsulphinyl)-L-alanine 
3-(Butyl sulfinyl)-alanine 
3-aminoalanine +  
3-chloroalanine +  
3-cyanoalanine  
3-fluorotyrosine +  
3-hydroxylysine 
3-hydroxynorvaline 
3-methylarginine +  
3-Methylenenorleucine 
3-methylhistidine 
3-naphthalen-2-ylalanine +  
3-nitrotyrosine +   
3-oxoalanine +  
4-(carboxymethyl)phenylalanine +  
4-(phosphonomethyl)phenylalanine +  
4-aminophenylalanine +  
4-aminotetrahydro-2H-thiopyran-4-carboxylic acid 
4-azaleucine 
4-azidophenylalanine +  
4-chloro-L-lysine 
4-fluorophenylalanine +  
4-hydroxy-4-methylglutamic acid +  
4-hydroxyleucine +  
4-Hydroxyprolylthreonine 
4-iodophenylalanine +  
4-methyleneglutamic acid +  
4-thiazolidinecarboxylic acid, 2-undecyl-, (4r)- 
5,5,5-trifluoroleucine 
5-bromotryptophan 
5-fluorotryptophan 
5-hydroxy-N-formylkynurenine +  
5-methyltryptophan +  
6-(2-amino-2-carboxyethyl)-4-hydroxybenzothiazole 
6-chlorotryptophan +  
6-hydroxydopa 
7-(2-amino-2-carboxyethyl)-5-hydroxy-2H-1,4-benzothiazine-3-carboxylic acid 
7-(2-amino-2-carboxyethyl)-5-hydroxy-3,4-dihydro-2H-1,4-benzothiazin-3-one 
7-chlorotryptophan +  
[(1S)-1-carboxy-3-[(2S)-2-hydroxy-3-[(E)-2,2,4-trimethyl-3-oxohexadec-4-enoyl]oxypropoxy]propyl]-trimethylazanium 
alliin +   
allysine +   
alpha-(methylamino)isobutyric acid  
alpha-(Methylenecyclopropyl)glycine 
alpha-amino fatty acid +   
alpha-amino-gamma-cyanobutanoic acid 
alpha-aminobutyric acid +  
alpha-methylhistidine +  
alpha-phenylglycine +   
Amiclenomycin 
Arginine hydrochloride 
argpyrimidine 
Armentomycin 
arogenic acid +  
aspartate family amino acid +   
Azatyrosine 
azoxybacilin 
benzylpenillamine 
Betaine homarine 
betanidin +   
brasilicardin A 
chloroalanine +  
Cilazaprilat +   
citrullines +  
Cucumopine 
Cucurbitine 
cyclo(Glu-Glu) 
CYCLOPROPYLALANINE 
Cystathionine sulfoxide 
cysteic acid +  
D-alpha-amino acid +   
D-penicillamine +   
Dehydro-proline 
Demethylphosphinothricin 
dihomomethionine +  
Dimethylallyltryptophan 
dityrosine +  
dopa +   
Dopaxanthin quinone 
Eglinazine 
Eglumetad 
epsilon-(Hexanoyl)lysine 
erythrose 4-phosphate/phosphoenolpyruvate family amino acid +   
Ethyl lysine 
Ethyl-L-NIO 
galactosaminic acid +  
gamma-glutamylputrescine +  
gamma-hydroxyarginine +  
gamma-thiomethyl glutamate 
glutamic acid 5-methyl ester +  
glutamic acid-2,3,3,4,4-d5 
glutamine family amino acid +   
hexahomomethionine +  
hexahomomethionine S-oxide 
Homoalanosine 
homoarginine +   
homocysteic acid +   
homocysteine +   
homocysteines +   
homocystines +  
Homoisoleucine 
Homolysine* 
homomethionine +  
homoserine betaine 
homoserine derivative +  
HON 
Humilixanthin 
hydroxy-amino acid +   
hydroxyallysine +  
Hypoglycin 
Ibotenic acid  
iminodiacetic acid +  
Indicaxanthin 
Isoclavulanic acid 
Isopyochelin 
Isowillardiine 
kynurenine +   
L-2-Amino-4-(2-aminoethoxy)-butanoic acid 
L-alanine +   
L-alanine-2,3,3,3-d4 
L-allothreonine 
L-Allysine Ethylene Acetal 
L-alpha-amino acid residue +   
L-arginine +   
L-asparagine +   
L-aspartic acid +   
L-Baikiain 
L-beta-(3-hydroxyureido)-alanine 
L-cysteine +   
L-glutamic acid +   
L-glutamine +   
L-histidine +   
L-Homotyrosine 
L-isoleucine +   
L-leucine +   
L-lysine +   
L-methionine +   
L-NIO 
L-Ornithine monochlorohydrate/ornithine 
L-phenylalanine +   
L-proline +   
L-selenocysteine +   
L-serine +   
L-threonine +   
L-tryptophan +   
L-tyrosine +   
L-valine +   
lanthionine +   
LSM-11903 
lupinic acid +  
Lysine Butyrate 
lysine-4,4,5,5-d4 
melagatran +   
methionine sulfone +  
methionine sulfoximine +   
Methylselenocysteine Se-oxide 
Miraxanthin-I 
Miraxanthin-III 
Musca-aurin VII 
Musca-aurin-I 
mycosporine-like amino acid +  
myriocin  
N(5)-(L-1-carboxyethyl)-L-ornithine 
N(5)-acyl-L-ornithine +  
N(5)-anhydromevalonyl-N(5)-hydroxy-L-ornithine 
N(5)-hydroxy-L-ornithine 
N(6)-(2,4-dinitrophenyl)lysine +  
N(6)-(2-carboxyethyl)lysine +  
N(6)-acetonyllysine 
N(6)-carbamoylmethyllysine 
N(6)-methyllysine 
N,N-Dimethyllysine 
N-(1-Carboxymethyl)-L-lysine 
N-(2,4-dinitrophenyl)serine 
N-(2,6-dichlorobenzyl)-3-[2-(2,6-dichlorophenyl)-6-quinolyl]-N-methylalanine +  
N-(3,5-dimethylphenyl)glycine +  
N-(5,6-diphenylfuro[2,3-d]pyrimidin-4-yl)glycine 
N-(p-hydroxyphenyl)glycine 
N-6-Trimethyllysine 
N-[2-(methylamino)ethyl]-N-[(thymin-1-yl)acetyl]glycine 
N-acyl-L-alpha-amino acid +   
N-alkylglycine +   
N-ethylasparagine +  
N-formylkynurenine +  
N-methyldopa +  
N-phenylglycine 
N-phenylserine 
N6-[(2R)-3,4-Dihydro-2H-pyrrol-2-ylcarbonyl]-L-lysine 
N6-\{[(4E)-4-Cycloocten-1-yloxy]carbonyl\}lysine 
N6-beta-Aspartyllysine 
N6-myristoyl lysine 
nitrotyrosine +   
Nomega-hydroxy-nor-l-arginine 
non-proteinogenic L-alpha-amino acid +   
Any L-alpha-amino acid which is not a member of the group of 23 proteinogenic amino acids.
O(4)-phosphotyrosine +  
O,2,3-trimethyltyrosine +  
O-acetylhomoserine +  
O-BENZYL-l-SERINE 
O-phosphoserine +   
O-Ureidohomoserine 
ornaline 
ornithine +   
Pegvaliase 
penicillamine +   
pentahomomethionine +  
pentahomomethionine S-oxide 
phenylalanine-d5 
Pleurocybellaziridin 
Portulacaxanthin I 
Portulacaxanthin III 
Proglinazine 
Pyridazomycin 
Pyridosine 
pyruvate family amino acid +   
Quisqualic acid  
S-ethylhomocysteine +   
S-methyl-L-Thiocitrulline (hydrochloride) 
S-Methylcysteine S-oxide 
S-Nitrosohomocysteine 
Se-methylselenocysteine +   
Selfotel 
serine phosphoethanolamine +  
sinefungin  
Spithioneine A 
Spithioneine B 
Stizolobate 
Stizolobic acid 
Stizolobinate 
Stizolobinic acid 
Tabtoxin biosynthesis intermediate 3 
Temocaprilat  
tert-butylglycine 
Tet-glycine 
tetrahomomethionine +  
tetrahydrotyrosine 
Thiazostatin A 
Thiazostatin B 
thioproline +  
thyronine +   
thyroxine +   
topaquinone +  
triazolealanine 
tricholomic acid 
trihomomethionine +  
Vulgaxanthin-I 
 (12R)-hydroxy-10,11-dihydroleukotriene E4 
 (2R)-2-ammonio-2-carboxylatoethyl-disulfanyl-oxopropanoate 
 (2S)-2-amino-4-phosphonobutanoic acid 
 (2S)-amino[(4R)-2-iminohexahydropyrimidin-4-yl]acetic acid 
 (2S,3R)-capreomycidine 
 (2S,3S)-beta-methylphenylalanine 
 (2S,4R)-hypoglycin A +  
 (2S,4S)-hypoglycin A +  
 (3S)-3-hydroxy-L-asparagine 
 (3S)-3-hydroxy-L-enduracididine 
 (3S)-3-hydroxy-L-lysine 
 (3S,4S)-3,4-dihydroxy-L-proline 
 (4R)-5-oxo-L-leucine 
 (4S)-4-hydroxy-L-isoleucine 
 (N(omega)-L-arginino)succinic acid  
 (S)-2-amino-6-boronohexanoic acid 
 (S)-3,5-dihydroxyphenylglycine  
 (S)-ATPA 
 1-(L-norleucin-6-yl)pyrraline 
 1-(L-norvalin-5-yl)pyrraline 
 14-carboxy-15,16,17,18,19,20-hexanor-leukotriene E3 
 16-carboxy-17,18,19,20-tetranor-leukotriene E3 
 16-carboxy-Delta(13)-17,18,19,20-tetranor-leukotriene E4 +  
 18-carboxy-19,20-dinor-leukotriene E4 
 2'-(S-L-cysteinyl)-L-histidine 
 2,5-dihydrophenyl-L-alanine 
 2,5-diiodo-L-histidine 
 2-(3-amino-3-carboxypropyl)-L-histidine +  
 2-(\{3-[(2S)-2-amino-2-carboxyethyl]-2,6-dioxo-3,6-dihydropyrimidin-1(2H)-yl\}methyl)benzoic acid 
 2-[3-carboxy-3-(dimethylamino)propyl]-L-histidine 
 2-[3-carboxylato-3-(trimethylammonio)propyl]-L-histidine +  
 2-hydroxy-5-[(1E)-(2-phenylethylidene)amino]-L-tyrosine 
 2-hydroxy-L-tryptophan 
 2-L-bromohistidine 
 2-methyl-L-glutamine 
 2-methyl-L-serine +  
 20-carboxyleukotriene E4 
 20-hydroxy-leukotriene E4 
 20-oxoleukotriene E4 
 3,5-dibromo-L-tyrosine 
 3,5-dichloro-L-tyrosine 
 3,5-diiodo-L-tyrosine +  
 3,5-dinitro-L-tyrosine 
 3-(2,4-dioxo-2,3,4,5,6,7-hexahydro-1H-cyclopenta[d]pyrimidin-1-yl)-L-alanine 
 3-(5-bromouracil-1-yl)-L-alanine 
 3-(5-fluorouracil-1-yl)-L-alanine  
 3-(5-iodouracil-1-yl)-L-alanine 
 3-(5-oxoisoxazolin-2-yl)-L-alanine 
 3-(5-oxoisoxazolin-4-yl)-L-alanine 
 3-(\{3-[(2S)-2-amino-2-carboxyethyl]-5-methyl-2,6-dioxo-3,6-dihydropyrimidin-1(2H)-yl\}methyl)thiophene-2-carboxylic acid 
 3-(N(tele)-L-histidino)-L-tyrosine residue 
 3-(pyrazol-1-yl)-L-alanine 
 3-(uracil-1-yl)-L-alanine 
 3-[(3R)-1-carbamimidoylpiperidin-3-yl]-L-alanine 
 3-[(3S)-1-carbamimidoylpiperidin-3-yl]-L-alanine 
 3-\{(3E)-4-hydroxy-6-oxo-3-[(2-phenylethyl)imino]cyclohexa-1,4-dien-1-yl\}-L-alanine 
 3-amino-L-alanine +  
 3-bromo-L-tyrosine +  
 3-chloro-L-phenylalanine 
 3-chloro-L-tyrosine 
 3-cyano-L-alanine +  
 3-fluoro-L-tyrosine 
 3-hydroxy-L-aspartic acid +  
 3-hydroxy-L-glutamic acid +  
 3-hydroxy-L-proline +  
 3-hydroxy-L-tryptophan +  
 3-hydroxy-L-valine +  
 3-hydroxy-O,5-dimethyl-L-tyrosine 
 3-iodo-L-tyrosine +  
 3-methyl-L-lanthionine 
 3-methyl-L-tyrosine 
 3-Methylamino-L-alanine 
 3-methylthioaspartic acid +  
 3-nitro-L-tyrosine +  
 3-O-(N-acetyl-beta-D-glucosaminyl)-L-serine +  
 3-O-(N-acetyl-beta-D-glucosaminyl)-L-threonine +  
 3-O-methyldopa 
 3-selenino-L-alanine +  
 3-thio-L-aspartic acid +  
 4-(3-methylbut-2-enyl)-L-tryptophan 
 4-chloro-L-phenylalanine +  
 4-chloro-L-threonine +  
 4-fluoro-L-threonine 
 4-fluorophenyl-L-alanine 
 4-hydroxy-4-methyl-L-glutamic acid +  
 4-hydroxy-L-glutamic acid +  
 4-hydroxy-L-lysine +  
 4-hydroxy-L-proline +  
 4-hydroxy-L-threonine 
 4-hydroxy-L-tryptophan 
 4-methylene-L-glutamic acid 
 4-methylene-L-glutamine 
 4-O-(beta-L-Araf)-cis-L-Hyp 
 4-O-(beta-L-Araf-(1->2)-beta-L-Araf-(1->2)-beta-L-Araf)-cis-L-Hyp 
 4-O-methyl-L-dopa 
 4-oxo-L-proline 
 4-phospho-L-aspartic acid +  
 5'-(N(6)-L-lysine)-L-tyrosylquinone +  
 5-chloro-L-tryptophan 
 5-hydroxy-L-arginine 
 5-hydroxy-L-kynurenine +  
 5-hydroxy-L-tryptophan 
 5-iodo-L-histidine 
 5-methyl-L-arginine +  
 5-oxo-L-proline +   
 6,7-dichloro-L-tryptophan 
 6-chloro-L-tryptophan 
 6-diazo-5-oxo-L-norleucine 
 6-fluoro-L-dopa +  
 6-hydroxy-L-dopa 
 7-(3-methylbut-2-enyl)-L-tryptophan 
 7-chloro-L-tryptophan 
 7-hydroxy-L-tryptophan +  
 acivicin  
 agaritine 
 alpha-D-GlcNAc-(1->4)-beta-D-GlcA-(1->4)-alpha-D-GlcNAc-(1->4)-beta-D-GlcA-(1->3)-beta-D-Gal-(1->3)-beta-D-Gal-(1->4)-beta-D-Xyl-(1->3)-L-Ser 
 alpha-methyl-L-dopa +   
 alpha-methyl-L-tyrosine 
 anticapsin 
 azaserine 
 beta-(N(pros)-L-histidino)-L-tyrosine 
 beta-guanidino-L-alanine 
 beta-L-aspartylhydroxamic acid 
 biocytin +  
 bis(dimethylamino)phospho-L-tyrosine 
 carboxynorspermidine 
 carboxyspermidine 
 cilastatin  
 cis-14-hydroxy-10,13-dioxo-7-heptadecenoic acid L-aspartate ester 
 cis-4-hydroxy-L-proline +  
 coprine 
 dainic acid A 
 deoxyhypusine +  
 dinoflagellate luciferin 
 discadenine 
 domoic acid  
 DP-987 
 erythro-5-phosphonooxy-L-lysine 
 felinine 
 FMN-L-threonine +  
 foscarbidopa +  
 foslevodopa +  
 fructoselysine 6-phosphate 
 furanomycin 
 fusarinine zwitterion +  
 gamma-carboxy-L-glutamic acid +  
 gamma-glutamyl-beta-aminopropiononitrile 
 gamma-glutamyl-gamma-aminobutyraldehyde 
 gamma-hydroxy-L-arginine +  
 gamma-L-glutamylputrescine 
 glycerol 1-phosphoserine +  
 glyoxal-lysine dimer 
 homoserine +  
 hypusine +  
 isonocardicin A 
 isonocardicin C 
 kainic acid +   
 L-2,4,6-trimethylphenylalanine +  
 L-2-amino-3-oxobutanoic acid 
 L-2-amino-4-(hydroxymethylphosphinoyl)butanoic acid 
 L-2-amino-4-chloropent-4-enoic acid 
 L-2-aminopimelic acid 
 L-3-oxoalanine +  
 L-6'-bromotryptophan +  
 L-Albizziine 
 L-alloisoleucine +  
 L-allysine +  
 L-alpha-(methylidenecyclopropyl)glycine 
 L-alpha-aminobutyric acid +  
 L-beta-carboxyaspartic acid 
 L-beta-ethynylserine 
 L-beta-methylthioasparagine 
 L-beta-methylthioaspartic acid 
 L-BMAA 
 L-canaline 
 L-canavanine 
 L-cysteic acid 
 L-cystine +   
 L-dihydroanticapsin 
 L-djenkolic acid 
 L-dopa +  
 L-enduracididine 
 L-erythro-beta-hydroxyasparagine 
 L-gamma-carboxyglutamic acid 
 L-glutamic acid 5-methyl ester 
 L-homoarginine  
 L-homocitrulline +  
 L-homolanthionine 
 L-homophenylalanine 
 L-indospicine 
 L-kynurenine +  
 L-lanthionine 
 L-Lathyrine 
 L-lupinic acid 
 L-m-tyrosine 
 L-methionine sulfone +  
 L-methionine sulfoximine +  
 L-mimosine  
 L-norleucine +  
 L-O,2,3-trimethyltyrosine +  
 L-ornithine +   
 L-polyhomomethionine +  
 L-propargylglycine +  
 L-serine O-sulfate 
 L-thialysine +  
 L-thyroxine +  
 L-topaquinone +  
 L-vinylglycine 
 leukotriene E3 +  
 leukotriene E4 +   
 lysidine +  
 lysidine monophosphate +  
 m-fluoro-L-phenylalanine 
 mannopine 
 melphalan  
 methyl-L-glutamic acid +  
 methylglyoxal-lysine dimer 
 N(3)-fumaroyl-(S)-2,3-diaminopropanoic acid 
 N(4)-glycosyl-L-asparagine +  
 N(5)-methyl-L-arginine 
 N(6),N(6)-dimethyl-L-lysine +  
 N(6)-(1-carboxyethyl)-L-lysine 
 N(6)-(glycylglycyl)-L-lysine +  
 N(6)-[(indol-3-yl)acetyl]-L-lysine 
 N(6)-acetimidoyl-L-lysine 
 N(6)-acetyl-N(6)-methyl-L-lysine +  
 N(6)-carboxy-L-lysine +  
 N(6)-carboxymethyl-L-lysine +  
 N(6)-dansyl-L-lysine 
 N(6)-formyl-L-lysine +  
 N(6)-glycyl-L-lysine 
 N(6)-methyl-L-lysine +  
 N(delta),N(omega')-dihydroxy-N(omega)-methyl-L-arginine zwitterion 
 N(delta)-hydroxy-L-arginine 
 N(delta)-hydroxy-N(omega)-methyl-L-argininium 
 N(delta)-hydroxy-N(omega)-methyl-L-citrulline zwitterion 
 N(delta)-hydroxy-N(omega)-methyl-N(omega)-nitroso-L-citrulline zwitterion 
 N(gamma)-nitro-L-arginine 
 N(omega),N'(omega)-dimethyl-L-arginine +  
 N(omega),N(omega)-dimethyl-L-arginine +   
 N(omega)-hydroxy-L-arginine +  
 N(omega)-methyl-L-arginine  
 N(omega)-phospho-L-arginine 
 N(pros)-methyl-L-histidine +  
 N(pros)-methyl-L-histidine zwitterion 
 N(pros)-phospho-L-histidine +  
 N(tele)-methyl-L-histidine +  
 N-(2,4-dinitrophenyl)-L-proline 
 N-(5'-phosphopyridoxyl)-L-alanine 
 N-carboxy-L-methionine +  
 N-ethyl-L-asparagine 
 N-formyl-L-kynurenine +  
 N-methyl-L-alpha-amino acid +   
 N4-hydroxymethyl-L-asparagine 
 O(4)-phospho-L-tyrosine +  
 O-(2-aminoethyl)-L-serine 
 O-(3-O-beta-D-galactosyl-N-acetyl-alpha-D-galactosaminyl)-L-serine +  
 O-(3-O-D-galactosyl-N-acetyl-beta-D-galactosaminyl)-L-serine 
 O-(alpha-D-mannosyl)-L-serine +  
 O-(N-acetyl-alpha-D-galactosaminyl)-L-serine +  
 O-(N-acetyl-alpha-D-galactosaminyl)-L-threonine +  
 O-(pantetheine-4'-phosphoryl)serine +  
 O-(S-acylpantetheine-4'-phosphoryl)serine +  
 O-[N-acetyl-alpha-neuraminyl-(2->6)-N-acetyl-alpha-D-galactosaminyl]-L-serine +  
 O-[N-acetyl-alpha-neuraminyl-(2->6)-N-acetyl-alpha-D-galactosaminyl]-L-threonine +  
 O-carbamoyl-L-serine 
 O-methyl-L-threonine +  
 O-methylserine 
 O-phospho-L-threonine +  
 O-ureido-L-serine 
 ovothiol A 
 ovothiol A disulfide 
 oxidized dinoflagellate luciferin 
 pentosidine 
 Phosphoallohydroxy-L-lysine 
 psicosyllysine 
 S-(1,2-dichlorovinyl)-L-cysteine +   
 S-(2-boronoethyl)-L-cysteine 
 S-(4-Methylthiobutylthiohydroximoyl)-L-cysteine 
 S-(5-histidyl)cysteine sulfoxide 
 S-(Hydroxyphenylacetothiohydroximoyl)-L-cysteine 
 S-(Indolylmethylthiohydroximoyl)-L-cysteine 
 S-(Phenylacetothiohydroximoyl)-L-cysteine 
 S-alkyl-L-cysteine S-oxide +  
 S-anthraniloyl-L-cysteine +  
 S-carboxymethyl-L-cysteine 
 S-farnesyl-L-cysteine +  
 S-hydrocarbyl-L-cysteine +   
 S-hydroxy-L-cysteine +  
 S-methyl-L-thiocitrulline  
 S-octanoyl-L-cysteine 
 S-oxy-L-cysteine +  
 Se-methyl-L-selenocysteine +   
 tabtoxinine beta-lactam +  
 Thalassemine 
 threo-3-methyl-L-aspartic acid 
 Tnp-Gln 
 trifluoro-L-methionine 
 tryptophan N-glucoside 
 tyrosine-4-azobenzenearsonate 

Synonyms
Related Synonyms: non-proteinogenic L-alpha-amino acids

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