Pyrimidine hydrazide compounds as pgds inhibitors

摘要

This invention is directed to a compound of formula (I): wherein R1, R2, R3, R4 and L1 are as defined herein, a pharmaceutical composition comprising the compound, and the use of the compound to treat allergic and/or inflammatory disorders, particularly disorders such as allergic rhinitis, asthma and/or chronic obstructive pulmonary disease (COPD).