8,9-diethoxy-3,4,5,6-tetrahydrocyclobuta[l]phenanthren-1(2H)-one InChI=1/C20H22O3/c1-3-22-18-10-14-12-7-5-6-8-13(12)15-9-17(21)20(15)16(14)11-19(18)23-4-2/h10-11H,3-9H2,1-2H cyclobuta[l]phenanthren-1(2H)-one, 8,9-diethoxy-3,4,5,6-tetrahydro-