Esterification of the title acid (I) gave esters II - VI. Halogenation of the acid I afforded its 5-chloro and 5-bromo derivatives, VII and VIII. Condensation of triesters XIV - XVII and of tetraester XVIII with guanidine, followed by hydrolysis, led to acids IX - XIII. Some of these compounds had a weak antineoplastic activity in animals with experimental transplantable tumours.
标题酸(I)的酯化反应产生了酯II-VI。酸I的卤代反应得到了其5-氯和5-溴衍生物,VII和VIII。三酯XIV-XVII和四酯XVIII与胍硝化反应,随后水解,得到酸IX-XIII。这些化合物中的一些在实验性移植性肿瘤动物中显示出弱的抗肿瘤活性。