preferred_name: O-acetyl-L-serine + hydrogen sulfide = L-cysteine + acetate
preferred_name_lc: o-acetyl-l-serine + hydrogen sulfide = l-cysteine + acetate
label: O-acetyl-L-serine + hydrogen sulfide = L-cysteine + acetate
label_lc: o-acetyl-l-serine + hydrogen sulfide = l-cysteine + acetate