Disclosed are compounds of the formula wherein Z1 is —CH2—or —C(O)—, R4 and R5 are carbon chains (and optionally, together can form a C2 bridge), u and v are independently an integer of 0-3 such that there sum is from 3 to 5, and R2 is heteroaryl, and R1 and R3 are as defined herein. Also disclosed are methods of treating pain, and methods of inhibiting the absorption of cholesterol using a compound of formula I.