Chromene modulators of chemokine receptor activity

A compound of formula (I):

• or a stereoisomer or a pharmaceutically acceptable salt thereof, wherein:
• R2 is H, or C1-4 alkyl;
• R3 and R3′ are independently H, C1-4 alkyl, C1-4 alkoxy, halo, or haloC1-4 alkyl;
• or R3 and R3′, when attached to neighboring carbons, taken together form —CH═CH—CH═CH—;
• R4 is H or C1-4 alkyl;
• W1 is N or C—Z′;
• W2 is N or C—Y′;
• W3 is N or C—X;
• X is H, C1-4 alkyl, C1-4 alkoxy, halo or haloC1-4 alkyl;
• Y and Y′ are independently H, C1-4 alkyl, C1-4 alkoxy, halo, haloC1-4 alkyl or NO2;
• Z and Z′ are independently H or halo;
• or Y and Z, Y′ and Z′, Y and X, or Y′ and X are taken together to form —CH═CH—CH═CH—;
• or Y and X or Y′ and X are taken together to form —O—CH2—O—;
• provided that:
• (1) one and only one of W1, W2 or W3 is N;
• (2) if W2 is N, then X, Y, Z and Z′ are not all H;
• (3) if W3 is N, then W1 and W2 are both CH and Y and Z are H;
• (4) if Y is C1-4alkoxy then X is not H;
• and
• (5) if X is F then one of Y or Y′ is not H.