Patent ID: 7402698

Claim:
A compound of formula I: or a pharmaceutically acceptable salt thereof; wherein: A is phenyl or naphthyl; where said A is optionally substituted with one or more R 1 ; W is OR 8 ; R 1 and R 2 are, independently, H, OH, alkyl, alkoxy, halo, trifluoromethyl, alkanoyloxy, methylenedioxy, benzyloxy where said benzyloxy is optionally substituted with one or more R 1 , phenyloxy optionally substituted with one or more R 1 , naphthyloxy optionally substituted with one or more R 1 , phenylethoxy optionally substituted with one or more R 1 , phenoxyethoxy optionally substituted with one or more R 1 , phenylcarbonylamino optionally substituted with one or more R 1 , phenylaminocarbonyl optionally substituted with one or more R 1 , nitro, trifluoromethoxy, nitrile, alkenyl, alkynyl, sulfoxide, sulfonyl, sulfonamido, phenyl optionally substituted with one or more R 1 , alkanoyl, alkoxycarbonyl, alkylaminocarbonyl, or amino; R 3 is H; R 4 is benzyl optionally substituted with one or more R 1 , naphthylmethyl optionally substituted with one or more R 1 , phenyl(C 2 -C 6 )alkyl optionally substituted with one or more R 1 , cycloalkyl, cycloalkenyl, or cycloalkylmethyl; R 6 and R 7 are, independently, (C 1 -C 6 )alkyl or (C 3 -C 6 )cycloalkyl, or R 6 and R 7 together form a ring of 4 to 8 carbon atoms; where R 6 and R 7 may be optionally substituted with R 8 or OH; where R 6 and R 7 can form a ring with 4 to 8 carbons fused onto a cycloalkyl ring of 4 to 6 carbon atoms; R 8 is H, (C 1 -C 4 )alkyl, or (C 1 -C 4 )alkyl-C(═O); and t is 1, 2, or 3.