(+)-4,4a,6,7,7a,8,9,9a-Octahidro-4a,8-dimetil-espiro[azuleno[6,5-b]furan-3(2H),3′-[1]pirazolin]-2,5(3aH)-diona
4,4′,4a,5′,6,7,7a,8,9,9a-Decahidro-4a,8-dimetil-espiro[azuleno[6,5-b]furan-3(3aH),3′-[3H]pirazol]-2,5-diona
C16H22N2O3
145-147 (dec.) (CHCl3 – (Et2O)
+405 (Dioxano)
Prismas
IR (CHCl3)
UV (EtOH)