1,3-diazabicyclo[3.1.0]hex-3-ene, 2,2-dimethyl-6-(4-nitrophenyl)-4-phenyl- 2,2-dimethyl-6-(4-nitrophenyl)-4-phenyl-1,3-diazabicyclo[3.1.0]hex-3-ene InChI=1/C18H17N3O2/c1-18(2)19-15(12-6-4-3-5-7-12)17-16(20(17)18)13-8-10-14(11-9-13)21(22)23/h3-11,16-17H,1-2H