A compound having the structure: or a pharmaceutically acceptable salt or solvate thereof, wherein A and A′ are C or N, where C may be substituted by halo or C1-C6 alkyl; R and R0 are selected from the group consisting of H, C1-C6 alkyl, —(CH2)n—W, etc., where W is 5- or 6-membered heteroaryl or heterocyclic containing N, S and/or O atoms, —NR″SO2—R′, etc., where R′ and R″ are C1-C6 alkyl, etc.; wherein each alkyl, etc., may be substituted; or, R and Ro and the N atom to which they are bonded together to form a monocyclic or bicyclic heterocyclic ring, etc.; R1 is H, halo or cyano; R2 and R2′ are H, C1-C6 alkyl, etc.; X is a bond, etc.; R3 is H, C1-C4 alkyl, etc.; Y is a bond, —(CH2)m—, etc. The invention also relates to compositions and uses in the treatment of various diseases.