| 摘要 |
The present invention is directed to novel compounds of the general formula wherein R is hydrogen, a straight, branched or cyclic hydrocarbon moiety consisting of less than 10, most preferably less than 4 carbon atoms and containing single and/or double bonds, an acetyl group and substituted acetyl groups including cyclic groups, such as cyclopropyl acyl group, alkoxy ether groups and alkyl substituted alkoxy ether moieties such as, but not limited to, CH2—O—CH2—R5 wherein R5 is a C1-C4 alkyl group as well as double bond containing alkyl groups; R1 is selected from the group consisting of hydrogen or a C1-C4 alkyl group and R2 and R3 is independently equal to methyl; and wherein one of the dashed lines between the 5 and 10 position, the 4 and 5 position and the 5 and 6 position represents a second C—C bond in a C═C double bond.
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