has role organic sulfide cystathionine CHEBI:4048 Cystathionine 2-amino-4-[(2-amino-2-carboxyethyl)sulfanyl]butanoic acid DL-Cystathionine KEGG:C00542 CHEBI:14059 CHEBI:17755 S-(2-amino-2-carboxyethyl)homocysteine cystathione A modified amino acid generated by enzymic means from homocysteine and serine. cystathionines metabolite