is tautomer of S-adenosyl-L-methionine organic cation sulfonium compound S-adenosyl-L-methionine zwitterion +1 399.145 399.44500 A zwitterionic tautomer of S-adenosyl-L-methionine arising from shift of the proton from the carboxy group to the amino group. C15H23N6O5S CHEBI:59789 C[S+](CC[C@H]([NH3+])C([O-])=O)C[C@H]1O[C@H]([C@H](O)[C@@H]1O)n1cnc2c(N)ncnc12 InChI=1S/C15H22N6O5S/c1-27(3-2-7(16)15(24)25)4-8-10(22)11(23)14(26-8)21-6-20-9-12(17)18-5-19-13(9)21/h5-8,10-11,14,22-23H,2-4,16H2,1H3,(H2-,17,18,19,24,25)/p+1/t7-,8+,10+,11+,14+,27?/m0/s1 MEFKEPWMEQBLKI-AIRLBKTGSA-O S-adenosyl-L-methionine [(3S)-3-azaniumyl-3-carboxylatopropyl](5'-deoxyadenosin-5'-yl)(methyl)sulfonium chebi_ontology