2,3,7,11b-Tetrahydro-10-nitro-11b-phenyloxazolo(3,2-d)(1,4)benzodiazepin-6(5H)-one 24143-26-8 BRN 0577094 Oxazolo(3,2-d)(1,4)benzodiazepin-6(5H)-one, 2,3,7,11b-tetrahydro-10-nitro-11b-phenyl-