| abstract |
The present invention relates to novel benzopyrane derivatives, especially 3-oxaloamino-4-oxo-4H-1-benzopyrane derivatives of the formula I ##STR1## in which Ph is substituted or unsubstituted 1,2-phenylene, R is free, esterified or amidated carboxyl and R 1 is hydrogen or a substituted or substituted hydrocarbon radical, in the free form or in the form of a salt, exhibit antiallergic activities and are accordingly useful as active ingredients of antiallergic pharmaceutical preparations. |