Tetrazolylcoumarin derivatives and antiallergic compositions containing the same
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United States of America Patent
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Sep 27, 1983
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N/A
app pub date -
May 6, 1981
filing date -
May 10, 1980
priority date (Note) -
Expired
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Abstract
Tetrazolylcoumarin derivatives of the general formula: ##STR1## wherein R is hydrogen atom, an alkyl group, an alkenyl group, an alkoxyalkyl group or phenyl group, n is an integer of 2 to 4, and the R--O--(CH.sub.2).sub.n --O-- group is substituted at any of the 5, 6, 7 and 8 positions of the coumarin ring, and the salts thereof. The compounds are useful as antiallergic agents for preventing and treating allergic diseases.
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