(1)Benzopyrano(2,3-b)(1,5)benzodiazepin-13(5ah)-one, 6,11-dihydro-2,6-dimethyl-7-nitro- 119707-38-9 6,11-Dihydro-2,6-dimethyl-7-nitro-(1)benzopyrano(2,3-b)(1,5)benzodiazepin-13(5ah)-one