label: 8-nitro-cGMP + L-cysteinyl-[protein] => S-(guanosine 3',5'-cyclic phosphate)-L-cysteinyl-[protein] + nitrite + H(+)
label_lc: 8-nitro-cgmp + l-cysteinyl-[protein] => s-(guanosine 3',5'-cyclic phosphate)-l-cysteinyl-[protein] + nitrite + h(+)