(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