Benzo[d]xanthen-9,12-dione, 1,2,3,4,4a,5,6,7,7a,8-decahyd ro-3-hydroxy-4,4,7,7a-tetramethyl-10-(1-methyl-2-oxo-3-pent enyl)-, [3S-[3.alpha.,4a.alpha.,4a.beta.,7.alpha.,7a.alpha.,10(1R*,3E),13aS*]]- NSC629662 Podosporin A