Patent ID: 7064102

Claim:
A compound of the formula (I) where a) R 1 =CH 3 , R 3 =H or CH 3 and R 2 and R 4 =H, R 5 and R 6 —independently of one another—are H or CH 3 and Y=—CR 7 R 8 OCOR 9 , where R 7 and R 8 —independently of one another—are H or CH 3 and R 9 is a branched or straight-chain C 1 to C 5 alkyl group or a branched or straight-chain C 2 to C 5 alkylene group, or b) R 1 and R 2 —independently of one another—are CH 3 or CH 2 CH 3 , R 3 and R 4 —independently of one another—are H or CH 3 , R 5 and R 6 together are oxygen and Y=—CR 7 R 8 OCOR 9 , where R 7 , R 8 and R 9 have the abovementioned meaning, or R 1 and R 2 —independently of one another—are CH 3 or CH 2 CH 3 , R 3 is H or CH 3 , R 4 is CH 3 , R 5 and R 6 together are oxygen, and Y=R 9 , where R 9 has the above meaning, or c) R 1 and R 2 —independently of one another—are CH 3 or CH 2 CH 3 , R 3 , R 4 , R 5 and R 6 —independently of one another—are H or CH 3 and Y=—CR 7 R 8 OCOR 9 , where R 7 , R 8 and R 9 have the abovementioned meaning.