| abstract |
Compounds of formula (I) are useful for the treatment of disease responsive to modulation of CRTH2 receptor activity, such as asthma, rhinitis, allergic airway syndrome, and allergic rhinobronchitis; wherein X1 is -S-, -O-, -N=N-. -NR7-, -CR7=CR8-, -CR7=N-, wherein R7 and R8 are independently hydrogen or C1-C3 alkyl; A is a carboxyl group -COOH, or a carboxyl bioisostere; rings Ar2 and Ar3 each independently represent a phenyl or 5- or 6~-membered monocyclic heteroaryl ring, or a bicyclic ring system consisting of a 5- or 6-membered carbocyclic or heterocyclic ring which is benz-fused or fused to a 5- or 6-membered monocyclic heteroaryl ring, said ring or ring system being optionally substituted; ring B is as defined for Ar2 and Ar3, or an optionally substituted N-~pyrrolidinyl, N-piperidinyl or N-azepinyl ring; s is 0 or 1; L1, L2 and L4 are linker radicals as defined in the description; Q1and Q2 represent substituents as defined in the description. |