(S)-S-adenosyl-L-methionine = (R)-S-adenosyl-L-methionine
(s)-s-adenosyl-l-methionine = (r)-s-adenosyl-l-methionine
(S)-S-adenosyl-L-methionine = (R)-S-adenosyl-L-methionine
(s)-s-adenosyl-l-methionine = (r)-s-adenosyl-l-methionine