AIDS-160273 AIDS160273 Deoxyprepacifenol NSC611358 {Spiro[cyclohexane-1,} {2'-[7]oxabicyclo[4.1.0]hept[4]ene],} 3,4'-dibromo-4-chloro-1',3', 3',4-tetramethyl-, {[1R-[1.alpha.,(1'S*,6'R*),3.beta.,4.alpha.]]-}