Patent ID: 7919133

Claim:
A compound of formula (I) or a mixture of compounds of formula (I) wherein: R 1 , R 2 , and R 3 are independently H or an alkyl group having 1 to 3 C-atoms, wherein at least one of R 1 , R 2 , and R 3 is not H; R 4 is H, an alkyl group having 1 to 6 C-atoms, or an alkenyl group having 2 to 6 C-atoms; R 5 , R 6 , R 7 , and R 8 are independently H or methyl; and R 9 is H, an alkyl group having 5 to 12 C-atoms, or an alkenyl group having 5 to 12 C-atoms; with the proviso that compounds of formula (III), are excluded.