amino-acid betaine selenoneine (2S)-3-(2-selenoxo-2,3-dihydro-1H-imidazol-4-yl)-2-(trimethylazaniumyl)propanoate 2-selenyl-N(alpha),N(alpha),N(alpha)-trimethyl-L-histidine 276.19000 277.033 A histidine derivative that is N(alpha),N(alpha),N(alpha)-trimethyl-L-histidine substituted by a selenoxo group at position 2 on the imidazole ring. A selenium-containing antioxidant found in tuna blood. C9H15N3O2Se CHEBI:79071 CHEBI:82733 C[N+](C)(C)[C@@H](Cc1c[nH][c](=[Se])[nH]1)C([O-])=O InChI=1S/C9H15N3O2Se/c1-12(2,3)7(8(13)14)4-6-5-10-9(15)11-6/h5,7H,4H2,1-3H3,(H2-,10,11,13,14,15)/t7-/m0/s1 MTIQLELFQVCRSW-ZETCQYMHSA-N MetaCyc:CPD-17041 PMCID:PMC4117592 PMID:20388714 PMID:21331438 PMID:21540999 PMID:22129736 PMID:23434904 PMID:24197605 PMID:24828577 Reaxys:15579936 chebi_ontology selenoergothioneine selnoneine thione L-histidine derivative