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 A represents a carboxyl group —COOH, or a carboxyl bioisostere; A1 is hydrogen or methyl; ring Ar1 is an optionally substituted phenyl ring or 5- or 6-membered monocyclic heteroaryl ring, in which AA1CHO— and L2 are linked to adjacent ring atoms; rings Ar2, 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; t is 0 or 1; L2 and L3 are linker radicals as defined in the description.

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 A represents a carboxyl group —COON, or a carboxyl bioisostere; A1, is hydrogen or methyl; ring Ar1 is an optionally substituted phenyl ring 5- or 6-membered monocyclic heteroaryl ring, in which AA1CHO— and L2 are linked to adjacent ring atoms; rings Are2, 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; t is 0 or 1; L2 and L3 are linker radicals as defined in the description.

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 A represents a carboxyl group —COON, or a carboxyl bioisostere; A1, is hydrogen or methyl; ring Ar1 is an optionally substituted phenyl ring 5- or 6-membered monocyclic heteroaryl ring, in which AA1CHO— and L2 are linked to adjacent ring atoms; rings Are2, 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; t is 0 or 1; L2 and L3 are linker radicals as defined in the description.

Abstract: Compounds of formula are CRTH2 ligands, useful for treatment of inflammatory, autoimmune, respiratory or allergy disease: wherein R1 is hydrogen or methyl and R2 is optionally substituted cycloalkyl, or optionally substituted non-aromatic heterocyclyl having to 6 ring atoms; or R1 and R2, taken together with the carbon atom to which they are attached form an optionally substituted cycloalkyl, or optionally substituted non-aromatic heterocyclyl having 4 to 6 ring atoms: or R1 and R2, taken together with the carbon atom to which they are attached form an optionally substituted cycloalkyl, or optionally substituted cycloalkyl, or optionally substituted non-aromatic heterocyclyl ring having 4 to 6 ring atoms; R is hydrogen or an optional substitutent by 1, 2 or 3 optional substituents; A is hydrogen or C1-C3 alkyl; and ring Ar is an optionally substituted phenyl or 5- or 6-membered monocyclic heteroaryl ring.

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; Q1 and Q2 represent substituents as defined in the description.