Patent ID: 7482313

Claim:
A compound of formula (I) wherein R is isopropyl or iso-propenyl; R 1 is hydrogen, methyl or ethyl; R 2 and R 3 are independently hydrogen, methyl, or ethyl; or R 2 and R 3 taken together is ethylidene; or R 2 and R 3 taken together is a divalent radical (CH 2 ) 2 which forms cyclopropane together with the carbon atom to which they are attached; R 4 and R 5 are independently hydrogen, hydroxy, C 1 to C 3 alkoxy, or C 2 to C 3 acyloxy; or R 4 and R 5 together with the carbon atom to which they are attached form a 1,3-dioxolane ring or a 1,3-dioxane ring; or R 4 and R 5 together with the carbon atom to which they are attached form a carbonyl group; the bond between C2 and C3 is a single bond, or the dotted line together with the bond between C2 and C3 represents a double bond; and the bond between C7 and C8 is a single bond, or the dotted line together with the bond between C7 and C8 represents a double bond.