Novel polycyclic gamma-pyrone derivatives having a carboxaldehyde group on the 3-position and optionally substituted on the 5, 6, 7, 8, 9 or 10 positions with a hydroxy, lower alkyl or lower alkoxy group are disclosed, as well as the corresponding N-substituted, formyl imine derivatives thereof. These compounds, and pharmaceutical compositions containing these compounds, are useful for the treatment of allergic conditions and for the treatment of hyperacidity.
CROSS REFERENCE TO RELATED APPLICATION
This application is a division of U.S. Ser. No. 480,647, filed June 19, 1974, now U.S. Pat. No. 3,887,585, which is a continuation-in-part of U.S. Ser. No. 352,135, filed Apr. 18, 1973, now abandoned.
