Inhibitors of histone methyltransferase G9a

A compound of formula (I)

• or a pharmaceutically acceptable salt thereof,
• wherein
• R1 and R2 are each independently selected from the group consisting of alkyl, and haloalkyl, or R1 and R2 together form an optionally substituted 3- to 6-membered cycloalkyl;
• R3 is selected from the group consisting of hydrogen, alkyl, alkylalkoxy, alkylamino, and haloalkyl;
• R4 is selected from the group consisting of hydrogen, ORa, SRa, NRbRc, haloalkyl, and alkyl, wherein alkyl is optionally substituted with halogen, haloalkyl, alkyl, aminoalkyl, alkoxy, cycloalkyl, aryl, heterocycle, and heteroaryl, wherein cycloalkyl, aryl, heterocycle, and heteroaryl are optionally substituted with alkyl, halogen, and haloalkyl;
• Ra is haloalkyl, cycloalkyl, or alkyl, wherein alkyl is optionally substituted with halogen, haloalkyl, alkyl, amino, aminoalkyl, alkoxy, cycloalkyl, aryl, heterocycle, and heteroaryl, wherein cycloalkyl, aryl, heterocycle, and heteroaryl are optionally substituted with alkyl, halogen, and haloalkyl;
• Rb and Rc are each independently haloalkyl, cycloalkyl, or alkyl, wherein alkyl is optionally substituted with halogen, haloalkyl, alkyl, aminoalkyl, alkoxy, cycloalkyl, aryl, heterocycle, and heteroaiyl, wherein cycloalkyl, aryl, heterocycle, and heteroaryl are optionally substituted with alkyl, halogen, and haloalkyl;
• or Rb and Rc together form an optionally substituted 3- to 6-membered heterocycle.