A compound of the formula I or a pharmaceutically acceptable salt thereof ** Formula ** wherein: R 1 is: - C 1 -C 6 alkyl； - methyl substituted with i) C3-C5 cycloalkyl； ii) phenoxy； or iii) a phenyl and a second substituent selected from the group consisting of: methyl, halo and methoxy； - ethyl substituted with i) phenyl, said phenyl is optionally substituted with halo or methoxy or ii) heteroaryl； - benzyl, wherein the phenyl group of said benzyl is optionally substituted with halo, methoxy or SO2CH2CH3； - C2 alkenyl optionally substituted with an F and a phenyl； - C3-C7 cycloalkyl, said cycloalkyl is optionally substituted with one or two substituents selected from the group consisting of phenyl, methyl and F； or said cycloalkyl is optionally fused with a phenyl ring； - heterocycloalkyl optionally substituted with one or two C1-C3 alkyls； - heteroaryl optionally substituted with one to two substituents selected from the group consisting of: C1-C3 alkyl, C1-C3 alkoxy and CF3； and - phenyl substituted with one to three substituents selected from the group consisting of: i) halo； ii) CN； iii) C1-C3 alkyl optionally substituted with one to three F； iv) C1-C3 alkoxy； v) (CH2) nNRaRb； vi) C (O) CH3； and vii) CH2OCH3； R2 is halo or C1-C3 alkyl； R3 is halo or methyl； R4 is H or methyl； R5 is C1-C3 alkyl； R6 is C1-C3 alkyl； R7 is selected from the group consisting of: - C1-C7 alkyl optionally substituted with one or more substituents selected from the group consisting of halo, C3-C5 cycloalkyl and CF3； - C3-C7 cycloalkyl optionally substituted with one or two substituents selected from the group consisting of F, CH2F, CHF2, methyl and methoxy, each k is 0 or 1； each p is 0 or 1； each n is 0, 1 or 2； each Ra is H or C1-C3 alkyl； each Rb is H or C1-C3 alkyl；Un compuesto de la fórmula I o una de sus sales farmacéuticamente aceptables**Fórmula** en donde: R1 es: - alquilo C1-C6； - metilo sustituido con i) cicloalquilo C3-C5； ii) fenoxi； o iii) un fenilo y un segundo sustituy
