DÉRIVÉS DE PYRIMIDINE POUR LE TRAITEMENT DE L'ASTHME, DE LA BRONCHO-PNEUMOPATHIE CHRONIQUE OBSTRUCTIVE (COPD), DE LA RHINITE ALLERGIQUE, DE LA CONJONCTIVITE ALLERGIQUE, DE LA DERMATITE ATOPIQUE, DU CANCER, DE L'HÉPATITE B, DE L'HÉPATITE C, DU VIH, DU VPP, DES INFECTIONS BACTÉRIENNES ET DE LA DERMATOSE
The present invention provides compounds of formula (I) wherein R1, R2, R3 and R4 are as defined in the specification, and pharmaceutically acceptable salts thereof, as well as processes for their preparation, pharmaceutical compositions containing them and their use in therapy.