(1)Benzopyrano(2,3-b)(1,5)benzodiazepin-13(5ah)-one, 6,11-dihydro-7-nitro-6-(phenylmethyl)- 119707-37-8 6,11-Dihydro-7-nitro-6-(phenylmethyl)-(1)benzopyrano(2,3-b)(1,5)benzodiazepin-13(5ah)-one