130817-81-1 4b,4c-Bis(acetyloxy)-4b,4c,9a,9b-tetrahydrocyclobuta(1,2-a:4,3-a')diindene-9,10-dione (4balpha,4cbeta,9abeta,9calpha)- 9,10-Dioxoindano(2',3'-4,3)cyclobuta(1,2-b)indan-4b,4c-diyl diacetate Cyclobuta(1,2-a:4,3-a')diindene-9,10-dione, 4b,4c-bis(acetyloxy)-4b,4c,9a,9b-tetrahydro-, (4balpha,4cbeta,9abeta,9calpha)- DCID