Compounds containing and method employing, as the essential ingredient, novel substituted xanthone carboxylic acid compound which are useful in the treatment of allergic conditions. Method for preparing these compounds and compositions and intermediates therein are also disclosed. 7-Trifluoromethylxanthone-2-carboxylic acid is illustrated as representative of the class.
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.
