Compounds of the general formula:
wherein R1 is heterocyclic group other than pryridyl and which is unsubstituted or substituted with lower alkyl or lower alkoxycarbonyl, R2 is hydrogen, halogen, or nitro, and R3 is carboxy group or its functional derivative, with the proviso that when R' is an unsubstituted furyl, or furyl mono-or polysubstituted with alkyl and R2 is hydrogen, then R3 is functional derivative of carboxy and, where applicable, pharmaceutically acceptable salts thereof are hyaluronidase inhibitors and useful as anti-allergic agent.
通式如下的化合物:其中 R1 是除溥啶基以外的杂环基团,且未被取代或被低级烷基或低级烷氧羰基取代;R2 是氢、卤素或硝基;R3 是羧基或其官能衍
生物,但当 R' 是未取代的
呋喃基,或
呋喃基被烷基单取代或多取代,且 R2 是氢时,则 R3 是羧基的官能衍
生物,适用时,其药学上可接受的盐是
透明质酸酶抑制剂,可用作抗过敏剂。