4H-Cyclopent(f)oxacyclotridecin-4,13(1H)-dione, 6,7,8,9,11a,12,14,14a-octahydro-1-hydroxy-6-methyl-, (1R-(1R*,2E,6S*,10E,11aS*,14aR*))- 62989-90-6 7-Dehydrobrefeldin A 7-Oxo-bfa