S-sulfanyl-L-cysteine + 2-aminoprop-2-enoate => L-cystine
s-sulfanyl-l-cysteine + 2-aminoprop-2-enoate => l-cystine
S-sulfanyl-L-cysteine + 2-aminoprop-2-enoate => L-cystine
s-sulfanyl-l-cysteine + 2-aminoprop-2-enoate => l-cystine