1H-Phenanthro(10,1-bc)furan-4,9(2H,5aH)-dione, 6-(acetyloxy)- 3,3a,6,6a,10,10a,10b,10c-octahydro-1,2,10-trihydroxy-3,7,10a,10c-tetramethyl-, (1R,2R,3R,3aS,5aS,6R,6aS,10S,10aR,10bR,10cR)-rel-( )- 441334-16-3 Eurycolactone F