The molecule is an organic cation that is the zwitterionic tautomer of L-adenosylselenomethionine arising from shift of the proton from the carboxy group to the amino group; major species at pH 7.3. It is a tautomer of a L-adenosylselenomethionine.
(2S)-4-[[(2S,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methyl-methylselaniumyl]-2-azaniumylbutanoate