has role has role has functional parent has functional parent amino-acid betaine imidazoles ergothioneine animal metabolite marine metabolite S-methyl-L-ergothioneine An amino acid betaine that is ergothioneine in which the hydrogen attached to the sulfur is replaced by a methyl group. It has been isolated from the deepwater (500-1,600 m) marine sponge <em>Macandrewia azorica</em>. (+)-L-methylergothioneine S-methylergothioneine 7S-(+)-methylergothioneine (+)-L-S-methylergothioneine L-(+)-S-methylergothioneine (+)-S-methylergothioneine CHEBI:90131 S-methyl-L-ergothioneine (2S)-3-[2-(methylsulfanyl)-1H-imidazol-4-yl]-2-(trimethylammonio)propionate CHEBI:76620 L-S-methylergothioneine (+)-S-methyl-L-ergothioneine chebi_ontology methyl sulfide