an alkyl thiol + 2-aminoprop-2-enoate => an S-alkyl-L-cysteine
an alkyl thiol + 2-aminoprop-2-enoate => an s-alkyl-l-cysteine
an alkyl thiol + 2-aminoprop-2-enoate => an S-alkyl-L-cysteine
an alkyl thiol + 2-aminoprop-2-enoate => an s-alkyl-l-cysteine