Patent ID: 6977303

Claim:
A compound having the formula V wherein R 1 and R 3 are, independently, branched or straight chain C 1 to C 20 alkyl; branched or straight chain C 1 to C 20 alkyl substituted with one to three groups selected from cyano, hydroxy, aryl, halogen, —OR, —CO 2 R, and —OCOR; C 3 to C 8 cycloalkyl; C 3 to C 8 cycloalkyl substituted with one to three groups selected from cyano, hydroxy, aryl, halogen, —OR, —CO 2 R, and —OCOR; C 6 to C 20 aryl; C 8 to C 20 aryl substituted with one to three groups selected from C 1 -C 6 -alkyl, C 6 -C 10 aryl, C 1 -C 6 -alkoxy, halogen, carboxy, cyano, C 1 -C 6 -alkanoyloxy, C 1 -C 6 -alkylthio, C 1 -C 6 -alkylsulfonyl, trifluoromethyl, hydroxy, C 2 -C 6 -alkoxycarbonyl, C 2 -C 6 -alkanoylamino, —OR′, SR′, —SO 2 R′, —NHSO 2 R′ or —NHCO 2 R′; or a 5- or 6-membered aromatic ring containing 1 to 3 heteroatoms selected from the group consisting of oxygen, sulfur and nitrogen, which may be substituted with up to three groups selected from C 1 -C 6 -alkyl, C 1 -C 6 -alkoxy, halogen, C 1 -C 6 -alkylthio, aryl, arylthio, aryloxy, C 2 -C 6 -alkoxycarbonyl and C 2 -C 6 -alkanoylamino; wherein R 1 can also be hydrogen, R 6 branched or straight chain C 1 to C 20 alkyl, branched or straight chain C 1 to C 20 alkyl substituted with one to three groups selected from cyano, hydroxy, aryl, halogen, —OR, —CO 2 R, and —OCOR, C 3 to C 8 cycloalkyl, or C 3 to C 8 cycloalkyl substituted with one to three groups selected from cyano, hydroxy, aryl, halogen, —OR, —CO 2 R, and —OCOR, and wherein R is C 1 to C 6 alkyl and R′ is phenyl, naphthyl, or phenyl or naphthyl substituted with one to three groups selected from C 1 -C 6 -alkyl, C 6 -C 10 aryl, C 1 -C 6 -alkoxy or halogen; and n is 2.