jolkinolide A

(5β,9β,10α)-8β,14β:12,16-Diepoxyabieta-11,13(15)-dien-16-one

(4aR,6aS,7aβ)-2,3,4,4aα,5,6,11aα,11b-Octahydro-4,4,8,11bβ-tetramethyl-1H-oxireno[1,10a]phenanthro[3,2-b]furan-9(7aH)-one