Antagonists of the muscarinic acetylcholine receptor m4

A compound of formula (I):

• or a pharmaceutically acceptable salt thereof, wherein:
• A is a five- or six-membered heteroarylene having 1, 2 or 3 heteroatoms independently selected from N, O and S;
• R1 is selected from hydrogen, halo, —ORa, —NRbRc, aryl, and heteroaryl;
• R2 is selected from hydrogen, C1-C4 alkyl, halo, and —ORd;
• R3 is selected from hydrogen and C1-C4 alkyl;
• R4 is selected from C1-C8 alkyl, C1-C8 alkenyl, and —(CReRf)n—Y′;
• each Y′ is independently selected from cycloalkyl, cycloalkenyl, heterocycle, aryl, and heteroaryl;
• each Ra, Rb, Rc, and Rd is independently selected from hydrogen, C1-C4 alkyl, C3-C6 cycloalkyl, and aryl;
• each Re is independently selected from hydrogen and C1-C4 alkyl;
• each Rf is independently selected from hydrogen, C1-C4 alkyl, and aryl;
• and
• n is 0, 1, 2, 3, or 4;
• wherein each aryl, heteroaryl, cycloalkyl, cycloalkenyl, and heterocycle is independently unsubstituted or substituted with 1, 2, or 3 substituents independently selected from C1-C4 alkyl, halo, C1-C4 haloalkyl, C1-C4 alkoxy, C1-C4 haloalkoxy, C1-C4 hydroxyalkyl, hydroxy, cyano, and benzyl.