Patent ID: 7538130

Claim:
A compound wherein n is 0, 1, 2, or 3; R 1 , R 2 , R 7 , and R 8 are each independently alkyl, cycloalkyl, alkylaryl, or aryl, optionally with one or more heteroatoms, with the proviso that R 1 and R 2 can together form a cycloalkyl group and, independently, R 7 and R 8 can together form a cycloalkyl group; Y is a sulfur free radical, OR 9 or SR 9 ; R 3 , R 4 , R 5 , and R 6 are each independently H, alkyl, cycloalkyl, aryl, or alkylaryl, optionally with one or more heteroatoms; and R 9 is alkyl, cycloalkyl, aryl, or alkylaryl, with one or more heteroatoms, wherein the one or more heteroatoms comprise a nitrogen or sulfur atom.