Patent ID: 7759043

Claim:
A compound of the formula I R 1 , R 2 and R 10 independently of one another are C 1 -C 20 alkyl, or C 1 -C 12 alkylphenyl; R 3 is NR 6 R 7 or SR 8 ; R 4 is hydrogen, C 1 -C 20 alkyl, NR 6 R 7 or SR 8 ; R 5 is hydrogen or C 1 -C 20 alkyl; R 6 and R 7 independently of one another are C 1 -C 20 alkyl, or R 6 and R 7 together with the N-atom to which they are attached form a 5 or 6 membered ring, which optionally is interrupted by O or NR 9 and which optionally additionally is substituted by one or more C 1 -C 4 alkyl; R 8 is phenyl or phenyl substituted by one or more C 1 -C 4 alkyl; and R 9 is hydrogen or C 1 -C 20 alkyl.