| abstract |
An alkoxycoumarin substituted by a heterocyclic radical, or the formula <IMAGE> I R1 and R2 independently of one another are each hydrogen, C1-C5-alkyl, trifluoromethyl, phenyl or halogen, or together form a C3-C5-alkylene chain, R3 is C1-C5-alkyl or halogen, n is an integer of from 0 to 3, R4 is hydrogen or C1-C4-alkyl and Het is one of the following heterocyclic radicals: <IMAGE> |