Purine derivative dihydrate, drugs containing the same as the active ingredient and intermediate in the production thereof

摘要

Dihydrate of 4-[[9-[(3-cyclopentyloxy-4-methoxy)benzyl]-6,8-dimethylpurin]-2-yl-3-oxypropyl]pyridine N-oxide, drugs containing the same and a compound useful as an intermediate in the production of this dihydrate.Because of having a phosphodiesterase IV inhibitory effect, this dihydrate is useful as a preventive and/or remedy for asthma, chronic obstructive lung disease and/or other inflammatory diseases.