4-epimatricin

[3S-(3α,3aα,4α,9α,9aα,9bβ)]-3a,4,5,9,9a,9b-hexahydro-9-hydroxy-3,6,9-trimethyl-2-oxoazuleno[4,5-b]-3H-furan-4-yl acetate

Matricin

(3S-(3alpha,3aalpha,4alpha,9alpha,9aalpha,9bbeta))-3a,4,5,9,9a,9b-Hexahydro-9-hydroxy-3,6,9-trimethyl-2-oxoazuleno(4,5-b)-3H-furan-4-yl acetate

(3S,3aR,4S,9R,9aS,9bS)-9-hydroxy-3,6,9-trimethyl-2-oxo-2,3,3a,4,5,9,9a,9b-octahydroazuleno[4,5-b]furan-4-yl acetate