Antagonists of the muscarinic acetylcholine receptor M4

A compound of formula (I):

• or a pharmaceutically acceptable salt thereof, wherein:
• A is an arylene or a five- or six-membered heteroarylene having 1, 2, or 3 heteroatoms independently selected from N, O, and S;
• Q is selected from NRa, O, and —NRb—C(O)—;
• m is 0, 1, or 2;
• R1 is selected from cycloalkyl, Br, —ORC, —NRdRe, and —NHCORf;
• n is 1 or 2;
• each R2 is independently selected from hydrogen, C1-C4 alkyl, halo, and —ORg;
• R3 is selected from hydrogen and C1-C4 alkyl;
• R4 is selected from —(CRhRi)p—Y′, hydrogen, C1-C8 alkyl, and C2-C8 alkenyl;
• R5 is selected from hydrogen, C1-C4 alkyl, halo, C1-C4 haloalkyl, C1-C4 alkoxy, and C1-C4 haloalkoxy;
• Y′ is selected from cycloalkyl, cycloalkenyl, heterocycle, aryl, and heteroaryl;
• each Ra, Rb, Rd, Re, Rf, and Rg is independently selected from hydrogen, C1-C4 alkyl, C3-C6 cycloalkyl, and aryl;
• each RC is independently selected from hydrogen, C3-C6 cycloalkyl, and aryl;
• each Rh is independently selected from hydrogen and C1-C4 alkyl;
• each Ri is independently selected from hydrogen, C1-C4 alkyl, C3-C6 cycloalkyl, and aryl;
• and p is 0, 1, 2, 3, or 4;
• wherein each aryl, heteroaryl, arylene, heteroarylene, cycloalkyl, cycloalkenyl, and heterocycle is independently unsubstituted or substituted with 1-5 substituents.