label: O(2)-(2,4-dinitro-5-(N-methyl-N-4-carboxyphenylamino)phenyl 1-N,N-dimethylamino)diazen-1-ium-1,2-diolate
label_lc: o(2)-(2,4-dinitro-5-(n-methyl-n-4-carboxyphenylamino)phenyl 1-n,n-dimethylamino)diazen-1-ium-1,2-diolate