γ-Lactona del ácido 6β-hidroxi-4-oxo-ambros-9-en-12-oico
[3R-(3α,3aβ,6aβ,9aα,9bβ)]-3,3a,4,6a,7,8,9a,9b-Octahidro-3,6,9a-trimetil-azuleno[4,5-b]furan-2,9-diona
Anhidro-franserina
(3R,3aS,6aS,9aR,9bR)-3,3a,4,6a,7,8,9a,9b-Octahidro-3,6,9a-trimetil-azuleno[4,5-b]furan-2,9-diona
C15H20O3
107-108 (Me2CO – i-Pr2O
-5 (CHCl3)
IR (CHCl3)
RMN1H (CDCl3)