Substituted amino acids

Compound	Structure
Alanine (Ala)
Serine (Ser)
Proline (Pro)
Valine (Val)
Threonine (Thr)
Cysteine (Cys)
Isoleucine (Ile)
Leucine (Leu)
Asparagine (Asn)
Aspartic acid (Asp)
Glutamine (Gln)
Lysine (Lys)
Glutamic acid (Glu)
Methionine (Met)
Histidine (His)
Acetylcysteine (NAC)
Phenylalanine (Phe)
Selenocysteine (Sec)
Arginine
Theanine
Citrulline
Tyrosine (Tyr)
3,4-Dihydroxyphenylalanine (L-DOPA)
Fenclonine (PCPA)
Melevodopa
Methyldopa
N-Acetyl-L-tyrosine (NALT)
Etilevodopa
Carbidopa
Caramboxin
Foslevodopa
Saxitoxin
Bestatin (Ubenimex)
Ubenimex
Domoic acid
Neosaxitoxin
Benzylpenicillin
Amoxicillin
Amastatin
Leu-enkephalin
Met-enkephalin
Thyroxine (T4)
α-Endorphin
γ-Endorphin
β-Endorphin