preferred_name: [sulfur-carrier protein]-L-cysteine + L-cysteine => [sulfur-carrier protein]-S-sulfanyl-L-cysteine + L-alanine
preferred_name_lc: [sulfur-carrier protein]-l-cysteine + l-cysteine => [sulfur-carrier protein]-s-sulfanyl-l-cysteine + l-alanine
label: [sulfur-carrier protein]-L-cysteine + L-cysteine => [sulfur-carrier protein]-S-sulfanyl-L-cysteine + L-alanine
label_lc: [sulfur-carrier protein]-l-cysteine + l-cysteine => [sulfur-carrier protein]-s-sulfanyl-l-cysteine + l-alanine