preferred_name: N(alpha)-acetyl-D-methionine = N(alpha)-acetyl-L-methionine
preferred_name_lc: n(alpha)-acetyl-d-methionine = n(alpha)-acetyl-l-methionine
label: N(alpha)-acetyl-D-methionine = N(alpha)-acetyl-L-methionine
label_lc: n(alpha)-acetyl-d-methionine = n(alpha)-acetyl-l-methionine