1H-cyclopent[b]anthracene-5,10-dione, 3,11-dimethyl- 3,11-Dimethyl-3a,11a-dihydro-1H-cyclopenta[b]anthracene-5,10-dione 3,11-dimethyl-1H-cyclopenta[b]anthracene-5,10-dione InChI=1/C19H14O2/c1-10-7-8-12-11(2)17-16(9-15(10)12)18(20)13-5-3-4-6-14(13)19(17)21/h3-7,9H,8H2,1-2H Sterequinone-A