3-(Tetrazol-5-yl), 4-methyl-8-alkoxy coumarins and anti-allergic compositions thereof
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United States of America Patent
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Dec 14, 1982
Grant Date -
N/A
app pub date -
Nov 15, 1979
filing date -
Nov 30, 1978
priority date (Note) -
Expired
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Abstract
Coumarin derivatives of the general formula: ##STR1## wherein R is hydrogen atom, an alkyl group or an alkenyl group, R.sup.1 is hydrogen atom, an alkyl group, an alkenyl group or an alkoxy group, and the OR and R.sup.1 groups each are substituted at any of the 5, 6, 7 and 8 positions of the coumarin ring, and the salt thereof. The compounds are useful as antiallergic agent for preventing and treating allergic diseases.
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