Compounds useful as modulators of TRPM8

A compound having structural Formula (Ib):

• or a salt or solvate thereof;
• wherein
• R5 or R6 is selected from C1-C3 alkyl, and the remaining R5 or R6 is selected from the group consisting of optionally substituted C3-C8 cycloalkyl and optionally substituted C3-C8 cycloalkenyl;
• X and X1 are N;
• R7 is C1-C3 alkyl;
• R8 is represented by (a) or (b):
• A is O;
• B is CH2, or C═O;
• C is CH2, or C═O;
• Ar and Ar1 are independently optionally substituted phenyl, or optionally substituted heteroaryl;
• and
• R11 is selected from the group consisting of hydrogen or optionally substituted C1-C4 alkyl.