preferred_name: an alkyl thiol + 2-aminoprop-2-enoate => an S-alkyl-L-cysteine
preferred_name_lc: an alkyl thiol + 2-aminoprop-2-enoate => an s-alkyl-l-cysteine
label: an alkyl thiol + 2-aminoprop-2-enoate => an S-alkyl-L-cysteine
label_lc: an alkyl thiol + 2-aminoprop-2-enoate => an s-alkyl-l-cysteine