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Last Updated: December 12, 2025

Claims for Patent: 4,474,787

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Summary for Patent: 4,474,787

Title:	7,6 Dioxo-4H,6H-pyrano[3,2-g]quinoline dicarboxylic acids and anti-allergic use thereof
Abstract:	There are described compounds of formula I ##STR1## in which an adjacent pair of R5, R6, R7 and R8 form a chain --COCH═CE--O--, and the remainder of R5, R6, R7 and R8, which may be the same or different, each represent hydrogen, hydroxy, alkyl, halogen, alkenyl, alkoxy, or --NR1 R2 in which R1 and R2, which are the same or different, are each hydrogen or alkyl, Rg is hydrogen, alkyl, alkenyl or phenyl-alkyl, and E is --COOH, a 5-tetrazolyl group or an (N-tetrazol-5-yl) carboxamido group, and pharmaceutically acceptable derivatives thereof. There are also described processes for making the compounds and pharmaceutical, e.g. anti-allergic, compositions containing the compounds.
Inventor(s):	Hugh Cairns, David Cox
Assignee:	King Pharmaceuticals Inc
Application Number:	US06/344,982
Patent Claims:

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