Fused imidazole derivatives as IDO/TDO inhibitors

A compound of Formula (I)

• or a pharmaceutically acceptable salt or solvate thereof, wherein:
• W1 is CR1 or N;
• W2 is CR2 or N;
• W3 is CR3 or N;
• W4 is CR4 or N;
• R1, R2, R3, and R4 are each independently H, OH, halogen, C1-C4 alkyl, C1-C4 alkoxy, C1-C4 haloalkyl, or C1-C4 haloalkoxy;
• Z1, Z2, and Z3 are each independently a single bond, CHRZ, or CH2CHRZ, wherein one of Z1, Z2, and Z3 is CHRZ, or one of Z1, Z2, and Z3 is CH2CHRZ;
• each RZ is independently H, OH, halogen, C1-C4 alkyl, C1-C4 alkoxy, C1-C4 haloalkyl, or C1-C4 haloalkoxy;
• Y is H, C1-C4 alkyl, or C1-C4 haloalkyl;
• n is 0, 1, 2, or 3;
• R5 is OH, halogen, C1-C4 alkoxy, or C1-C4 haloalkoxy;
• R6 is H, OH, halogen, C1-C4 alkoxy, or C1-C4 haloalkoxy;
• and
• R7 and R8 are each independently H, halogen, C1-C4 alkyl, or C1-C4 haloalkyl.