4,6-Methanocyclobuta[cd]cyclopropa[3,4]benzo[1,2-a]pentalen-5(1H)-one, 1a,2-bis(acetyloxy)-6-[(acetyloxy)methyl]dodecahydro-3a,4-dihydroxy-1,1,3,5a-tetramethyl-, (1aS,2R,3R,3aS,3bS,4S,5aR,6R,6bS)- AIDS-161956 AIDS161956 Photo product