3,3'-Dinitrodiphenyl disulfide 537-91-7 Bis(3-nitrophenyl) disulfide Bis(m-nitrophenyl) disulfide Disulfide, bis(3-nitrophenyl) Disulfide, bis(m-nitrophenyl) Hinagen Megasul NP NSC66160 Nitrophenide m,m'-Dinitrodiphenyl disulfide