2-PYRIDYL CHROMANS AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM

摘要

Novel compounds of formula (I), or N-oxide thereof,

or tautomers thereof, or where appropriate a salt or ester thereof, wherein R<1> and R<2> each represent four substituents, and R<3> and R<4> are the same or different and each is selected from hydrogen atoms and (lower) alkyl groups, are active against viruses, especially rhinoviruses. Methods for producing the compounds are described, as are pharmaceutical formulations and methods for administering the compounds to cure or prevent rhinoviral infections.