121251-68-1 Spiro(bicyclo(4.1.0)heptane-2,5'-(1,3)dioxane), 2',2',3,7,7-pentamethyl-, (1R,3R,6S)-rel- Spiro(bicyclo(4.1.0)heptane-2,5'-(1,3)dioxane), 2',2',3,7,7-pentamethyl-, (1alpha,3beta,6alpha)-