1,5-Dihydro-1,5-dioxo-N- 1H-tetrazol-5-yl-4H-[1]benzopyrano[3,4-

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...


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424256, 26034345, C07D49104




The present invention relates to 1,5-dihydro-1,5-dioxo-N-1H-tetrazol-5-yl-4H-[1]benzopyrano[3,4-b]pyridine- 3-carboxamides having the following structural formula: ##STR1## wherein R.sub.1 is hydrogen, halogen, hydroxy, lower alkoxy, lower alkyl or nitro and R.sub.2 is hydrogen or lower alkyl.
These compounds and their pharmaceutically acceptable salts are useful in the management of allergic manifestations such as bronchial asthma, hay fever and the like.

patent: 3689497 (1972-09-01), Brown et al.


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