Disclosed are chemical entities that inhibit ubiquitin-activating enzyme (UAE), each of which is a compound of Formula (/): or a pharmaceutically acceptable salt thereof, wherein Y is Formula (II) and W, Z, XY, RY1, RY2 and RY3 are defined herein; pharmaceutical compositions comprising the chemical entities; and methods of using the chemical entities. These chemical entities are useful for treating disorders, particulariy cell proliferation disorders, including cancers.