Manoyl oxide

1H-Naphtho[2,1-b]pyran,3-e

(3R,6aα,10bα)-Dodecahydro-3,4aβ,7,7,10aβ-pentamethyl-3-vinyl-1H-naphtho[2,1-b]pyran

(3R,6aα,10bα)-3α-Vinyl-3,4aβ,7,7,10aβ-pentamethyldodecahydro-1H-naphtho[2,1-b]pyran