A compound of formula or a pharmaceutically acceptable salts thereof, wherein: X is -CH 2 -; or -CHOH-; Y is hydrogen; or -NR d R e wherein one of R d and R e is hydrogen, and the other is hydrogen; alkyl; cycloalkyl; cycloalkylalkyl; haloalkyl; haloalkoxy; hydroxyalkyl; alkoxyalkyl; acetyl; alkylsulfonyl; alkylsulfonylalkyl; aminocarbonyloxyalkyl; hydroxycarbonylalkyl; hydroxyalkyloxycarbonylalkyl; aryl; aralkyl; arylsulfonyl; heteroaryl; heteroarylalkyl; heteroarylsulfonyl; heterocyclyl; or heterocyclylalkyl; D is an optional oxygen; R 1 is isopropyl; R 2, R 3, R 4 and R 5 each independently is hydrogen; alkyl; alkenyl; amino; halo; amido; haloalkyl; alkoxy; hydroxy; haloalkoxy; nitro; amino; hydroxyalkyl; alkoxyalkyl; hydroxyalkoxy; alkynylalkoxy; alkylsulfonyl; arylsulfonyl; cyano; aryl; heteroaryl; heterocyclyl; heterocyclylalkoxy; aryloxy; heteroaryloxy; aralkyloxy; heteroaralkyloxy; optionally substituted phenoxy; -(CH 2) m - n - -R f or -(CH 2) m - n -SO 2 -(NR g) n -R f where m and n each independently is 0 or 1, Z is O or NR g, R f is hydrogen, alkyl, hydroxy, alkoxy, amino, hydroxyalkyl or alkoxyalkyl, and each R g is independently hydrogen or alkyl; or R 3 and R 4 may together form an alkylene dioxy; or R 3 and R 4 together with the atoms to which they are attached may form a five or six-membered ring that optionally includes one or two heteroatoms selected from O, S and N; or R 2 and R 3 may together form an alkylene dioxy; or R 2 and R 3 together with the atoms to which they are attached may form a five or six-membered ring that optionally includes one or two heteroatoms selected from O, S and N; R 6 is hydrogen; alkyl; halo; haloalkyl; amino; or alkoxy; and one of R 7 and R 8 is hydrogen, and the other is hydrogen; alkyl; cycloalkyl; cycloalkylalkyl; haloalkyl; haloalkoxy; hydroxyalky; alkoxyalkyl; acetyl; alkylsulfonyl; alkylsulfonylalkyl; aminocarbonyloxyalkyl; hydroxycarbonylalkyl; hydroxyalkyloxycarbonylalkyl; aryl; aralkyl; arylsulfonyl; heteroaryl; heteroarylalkyl; heteroarylsulfonyl; heterocyclyl; or heterocyclylalkyl. X is -CH 2 -; or -CHOH-; Y is hydrogen; or -NR d R e wherein one of R d and R e is hydrogen, and the other is hydrogen; alkyl; cycloalkyl; cycloalkylalkyl; haloalkyl; haloalkoxy; hydroxyalkyl; alkoxyalkyl; acetyl; alkylsulfonyl; alkylsulfonylalkyl; aminocarbonyloxyalkyl; hydroxycarbonylalkyl; hydroxyalkyloxycarbonylalkyl; aryl; aralkyl; arylsulfonyl; heteroaryl; heteroarylalkyl; heteroarylsulfonyl; heterocyclyl; or heterocyclylalkyl; D is an optional oxygen; R 1 is isopropyl; R 2, R 3, R 4 and R 5 each independently is hydrogen; alkyl; alkenyl; amino; halo; amido; haloalkyl; alkoxy; hydroxy; haloalkoxy; nitro; amino; hydroxyalkyl; alkoxyalkyl; hydroxyalkoxy; alkynylalkoxy; alkylsulfonyl; arylsulfonyl; cyano; aryl; heteroaryl; heterocyclyl; heterocyclylalkoxy; aryloxy; heteroaryloxy; aralkyloxy; heteroaralkyloxy; optionally substituted phenoxy; -(CH 2) m - n - -R f or -(CH 2) m - n -SO 2 -(NR g) n -R f where m and n each independently is 0 or 1, Z is O or NR g, R f is hydrogen, alkyl, hydroxy, alkoxy, amino, hydroxyalkyl or alkoxyalkyl, and each R g is independently hydrogen or alkyl; or R 3 and R 4 may together form an alkylene dioxy; or R 3 and R 4 together with the atoms to which they are attached may form a five or six-membered ring that optionally includes one or two heteroatoms selected from O, S and N; or R 2 and R 3 may together form an alkylene dioxy; or R 2 and R 3 together with the atoms to which they are attached may form a five or six-membered ring that optionally includes one or two heteroatoms selected from O, S and N; R 6 is hydrogen; alkyl; halo; haloalkyl; amino; or alkoxy; and