label: (indol-3-yl)butanoate + L-cysteine + ATP = (indol-3-yl)butanoyl-L-cysteine + AMP + diphosphate + H(+)
label_lc: (indol-3-yl)butanoate + l-cysteine + atp = (indol-3-yl)butanoyl-l-cysteine + amp + diphosphate + h(+)