(1)Benzopyrano(2,3-b)(1,5)benzodiazepin-13(5ah)-one, 6,11-dihydro-2-chloro-1,6-dimethyl-7-nitro- 119707-44-7 5a,6-Dihydro-2-chloro-1,6-dimethyl-7-nitro-benzopyrano(2,3-b)(1,5)benzodiazepin-13(11H)-one