Patent ID: 7189737

Claim:
A 2β,3β substituted compound of the formula: wherein R 1 is hydrogen or C 1-5 alkyl, X is H, C 1-6 alkyl, C 3-8 cycloalkyl, C 1-4 alkoxy, C 2-6 alkynyl, halogen, amino, or acylamido, Z is H, I, Br, Cl, F, CN, CF 3 , NO 2 , N 3 , OR 1 , CONH 2 , CO 2 R 1 , C 1-6 alkyl, NR 4 R 5 , NHCOR 5 , or NHCO 2 R 6 , R 4 is C 1-6 alkyl, R 5 is C 1-6 alkyl, R 6 is C 1-6 alkyl, and R b is C 1-6 alkyl, phenyl, or C 1-6 alkyl substituted phenyl, or a pharmaceutically acceptable salt thereof.