2 L-cysteine <=> S-sulfanyl-L-cysteine + L-alanine
2 l-cysteine <=> s-sulfanyl-l-cysteine + l-alanine
2 L-cysteine <=> S-sulfanyl-L-cysteine + L-alanine
2 l-cysteine <=> s-sulfanyl-l-cysteine + l-alanine