preferred_name: L-cystine = S-sulfanyl-L-cysteine + 2-aminoprop-2-enoate
preferred_name_lc: l-cystine = s-sulfanyl-l-cysteine + 2-aminoprop-2-enoate
label: L-cystine = S-sulfanyl-L-cysteine + 2-aminoprop-2-enoate
label_lc: l-cystine = s-sulfanyl-l-cysteine + 2-aminoprop-2-enoate