Patent ID: 7485653

Claim:
A composition comprising a carrier or excipient and an optically active compound having the Formula I: or a and pharmaceutically acceptable salt thereof, wherein: R 1 and R 5 are, independently, phenyl, pyridine, pyrimidine, thiophene, furan, oxazole, isoxazole, thiazole, isothiazole, imidazole and pyrazole, and any of R 1 and R 5 may be optionally substituted by one or more of halogen, NO 2 , CN, CF 3 , C 1-4 -alkyl, C 0-4 -alkyl-S, C 0-4 -alkyl-O, C 0-4 -alkyl-NH, (C 1-4 -alkyl) 2 —N, C 1-4 -alkyl-SO, C 1-4 -alkyl-SO 2 , SO 2 NH—C 0-4 -alkyl, SO 2 N(C 1-4 -alkyl) 2 , NHSO 2 —C 1-4 -alkyl, CONH—C 0-4 -alkyl, NHCO—C 1-4 -alkyl and COO—C 0-4 -alkyl; wherein R 2 is C 1-4 -alkyl; R 3 and R 4 are C 0-4 -alkyl; and alkyl may be straight or branched chain; and wherein n is 1-4; wherein the composition is substantially free of the R-form.