Medicament, characterized in that it comprises a compound of formula: in which: R1 represents: • -(C1-C4)alkyl • -(C1-C4) haloalkyl R2 represents: • a group: • a group: • a group: -A -X R3 represents: • -H • halogen • -(C1-C6)alkyl • a cyano group • -CO 2 H • -CONH 2 A represents: • an aryl or heteroaryl group X is absent or represents: • halogen • a cyano group • an oxo group • -(CH 2)nOH • -(C1-C6)haloalkyl • -(C1-C6)alkyl • -(C1-C6)alkoxy • - n-aryl • -CHOH-aryl • heterocycle • heteroaryl • -(C1-C6)alkyl-heterocycle • -(C1-C6)alkyl-heteroaryl • -(C1-C6)alkyl-COORa • -(C1-C6)alkyl-NRaRb • -heteroaryl- n-NRaRb • - n-NRa-C -Rb • -NRaRb • -NRa- n-O-Rb • -NRa-heterocycle • -NRa-aryl • -NRa-C - n-NRaRb • -NRa-C -aryl • -NRaC -(C1-C6)alkyl • 1-NRa-C -(C1-C6)alkyl-aryl • -NRa-C - n-O-Rb • -NRa-SO2- n-aryl • -NRa-SO2- n-NRaRb • -NRa-SO2-Rb • -NRa-SO2-aryl-O-aryl • -NRa-SO2-aryl- n-NRb-C -Rb • -COORa • -CONRaRb • -C -NRa- n-O-Rb • -C -NRa-aryl-C -NRaRb • -C -NRa- n-NRaRb • -C -NRa- n-heteroaryl • -O- n-NRaRb • -O-heterocycle • -CO-heterocycle • -CO-heteroaryl • -SO2NRaRb • -SO2-heterocycle Ra and Rb represent, independently: • -H • -(C1-C6)alkyl n represents 0, 1, 2 or 3 or an addition salt of this compound with a pharmaceutically acceptable acid. R1 represents: • -(C1-C4)alkyl • -(C1-C4) haloalkyl • -(C1-C4)alkyl • -(C1-C4) haloalkyl R2 represents: • a group: • a group: • a group: -A -X • a group: • a group: • a group: -A -X R3 represents: • -H • halogen • -(C1-C6)alkyl • a cyano group • -CO 2 H • -CONH 2 • -H • halogen • -(C1-C6)alkyl • a cyano group • -CO 2 H • -CONH 2 A represents: • an aryl or heteroaryl group • an aryl or heteroaryl group X is absent or represents: • halogen • a cyano group • an oxo group • -(CH 2)nOH • -(C1-C6)haloalkyl • -(C1-C6)alkyl • -(C1-C6)alkoxy • - n-aryl • -CHOH-aryl • heterocycle • heteroaryl • -(C1-C6)alkyl-heterocycle • -(C1-C6)alkyl-heteroaryl • -(C1-C6)alkyl-COORa • -(C1-C6)alkyl-NRaRb • -heteroaryl- n-NRaRb • - n-NRa-C -Rb • -NRaRb • -NRa- n-O-Rb • -NRa-heterocycle • -NRa-aryl • -NRa-C - n-NRaRb • -NRa-C -aryl • -NRaC -(C1-C6)alkyl • 1-NRa-C -(C1-C6)alkyl-aryl • -NRa-C - n-O-Rb • -NRa-SO2- n-aryl • -NRa-SO2- n-NRaRb • -NRa-SO2-Rb • -NRa-SO2-aryl-O-aryl • -NRa-SO2-aryl- n-NRb-C -Rb • -COORa • -CONRaRb • -C -NRa- n-O-Rb • -C -NRa-aryl-C -NRaRb • -C -NRa- n-NRaRb • -C -NRa- n-heteroaryl • -O- n-NRaRb • -O-heterocycle • -CO-heterocycle • -CO-heteroaryl • -SO2NRaRb • -SO2-heterocycle • halogen • a cyano group • an oxo group • -(CH 2)nOH • -(C1-C6)haloalkyl • -(C1-C6)alkyl • -(C1-C6)alkoxy • - n-aryl • -CHOH-aryl • heterocycle • heteroaryl • -(C1-C6)alkyl-heterocycle • -(C1-C6)alkyl-heteroaryl • -(C1-C6)alkyl-COORa • -(C1-C6)alkyl-NRaRb • -heteroaryl- n-NRaRb • - n-NRa-C -Rb • -NRaRb • -NRa- n-O-Rb • -NRa-heterocycle • -NRa-aryl • -NRa-C - n-NRaRb • -NRa-C -aryl • -NRaC -(C1-C6)alkyl • 1-NRa-C -(C1-C6)alkyl-aryl • -NRa-C - n-O-Rb • -NRa-SO2- n-aryl • -NRa-SO2- n-NRaRb • -NRa-SO2-Rb • -NRa-SO2-aryl-O-aryl • -NRa-SO2-aryl- n-NRb-C -Rb • -COORa • -CONRaRb • -C -NRa- n-O-Rb • -C -NRa-aryl-C -NRaRb • -C -NRa- n-NRaRb • -C -NRa- n-heteroaryl • -O- n-NRaRb • -O-heterocycle • -CO-heterocycle • -CO-heteroaryl • -SO2NRaRb • -SO2-heterocycle Ra and Rb represent, independently: • -H • -(C1-C6)alkyl • -H • -(C1-C6)alkyl