| 摘要 |
The invention provides novel esters of 7-hydroxycoumarin of the formula <IMAGE> in which each of R1 and R2 represents a hydrogen atom, a C1-C4 alkyl, C2-C4 alkenyl, carboxy, carboxylate, C2-C5 alkoxycarbonyl or nitrophenyl group, and R3 represents a hydrogen atom or a group of the formula -CH2-Z in which Z represents a di(C1-C4alkyl)amino group, or a saturated heterocyclic amino radical containing 5 to 7 ring members which may contain a further heteroatom, and their pharmaceutically acceptable acid addition salts. The compounds are useful as medicaments, in particular as analgesics.
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