has role carnitine D,L-carnitine CHEBI:20047 Patent:US4315944 3-hydroxy-4-(trimethylammonio)butanoate CHEBI:11817 carnitine Wikipedia:Carnitine KEGG:C00487 CHEBI:23038 MetaCyc:DL-CARNITINE CHEBI:17126 An amino-acid betaine that is butanoate substituted with a hydroxy group at position C-3 and a trimethylammonium group at C-4. Patent:US4255449 CHEBI:13947 DrugBank:DB02648 butyrate amino-acid betaine carnitinium mouse metabolite human metabolite