主权项 |
1. A compound of formula I: wherein X is C1-C3alkylene, optionally substituted with one, two or three substituents selected from halogen or hydroxyl; R1 is selected from the group consisting of C1-C6alkyl, C3-C6cycloalkyl, C2-C6alkenyl, and C2-C6alkynyl; R2 is selected from the group consisting of hydrogen and C1-C6alkyl; R3 is independently selected, for each occurrence from the group consisting of hydrogen, C1-C6alkyl, cyano, C3-C6cycloalkyl, hydroxyl, and nitro; R4 is selected from the group consisting of hydrogen and C1-C6alkyl; R5 is hydrogen or C1-C6alkyl; or pharmaceutically acceptable salts or N-oxides thereof.
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