1-Aminooxy-2,4-dinitrobenzene 17508-17-7 2,4-Dinitrophenoxyamine 2,4-Nitrophenoxyamine DNPA EINECS 241-512-6 Hydroxylamine, O-(2,4-dinitrophenyl)- (8CI)(9CI) NSC 148499 O-(2,4-Dinitrophenyl)hydroxylamine