6-Deoxygeigerin

(3R)-3α,5,8β-Trimethyl-3,3aα,4,7,7aβ,8,9,9aα-octahydroazuleno[6,5-b]furan-2,6-dione

(3R)-3aα,7,7aβ,8,9,9aα-Hexahydro-3α,5,8β-trimethylazuleno[6,5-b]furan-2,6(3H,4H)-dione