preferred_name: N-acetyl-D-phenylalanine = N-acetyl-L-phenylalanine
preferred_name_lc: n-acetyl-d-phenylalanine = n-acetyl-l-phenylalanine
label: N-acetyl-D-phenylalanine = N-acetyl-L-phenylalanine
label_lc: n-acetyl-d-phenylalanine = n-acetyl-l-phenylalanine