Disclosed are compounds of the formula or a pharmaceutically acceptable salt thereof, wherein M1 is M2 is N; X is a bond, optionally substituted alkylene, alkenylene, —O—, —CH2N(R12)—, —N(R12)CH2—, —N(R12)—, —NHC(O)—, —OCH2—, —CH2O—, or —S(O)0-2—; and Y is —(CH2)1-2—, —C(═O)—, —C(═NOR13)— or —SO0-2—; or M1 is N; M2 is N or CH; X is a bond, alkylene, alkenylene, —C(O)—, —NHC(O)—, —OC(O)— or —S(O)1-2—; Y is —(CH2)1-2—, —C(═O)— or —SO0-2—; and when M2 is CH, Y is also Y is —O— or —C(═NOR13)—; Z is a bond or optionally substituted alkylene or alkenylene; U and W are CH, or one is CH and one is N; R1 is optionally substituted alkyl, cycloalkyl, aryl, arylalkyl, heteroaryl, heterocycloalkyl; R2 is optionally substituted alkyl, alkenyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl or heterocycloalkyl; and the remaining variables are as defined in the specification; and compositions and methods of treating obesity, metabolic syndrome and a cognition deficit disorder, alone or in combination with other agents.