(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 => (s)-s-adenosyl-l-methionine