2-(6,6-dimethylbicyclo[3.1.1]hept-2-yl)-2,3-dihydrochromeno[3,4-c]pyrrol-1(4H)-one InChI=1/C20H23NO2/c1-20(2)13-7-8-16(15(20)9-13)21-10-12-11-23-17-6-4-3-5-14(17)18(12)19(21)22/h3-6,13,15-16H,7-11H2,1-2H [1]benzopyrano[3,4-c]pyrrol-1(4H)-one, 2-(6,6-dimethylbicyclo[3.1.1]hept-2-yl)-2,3-dihydro-