The invention relates to treatment of diseases caused by thromboxane A.sub.2 comprising administering a compound ##STR1## wherein R.sup.1 is hydrogen or lower alkyl, R.sup.2 is carboxy(lower)alkyl or protected carboxy(lower)alkyl and R.sup.3 is --CH.dbd.N--R.sup.4 in which R.sup.4 is arylureido or arylthioureido and X is --O--, or a pharmaceutically acceptable salt thereof.
该发明涉及治疗由血栓素A.sub.2引起的疾病,包括给予化合物##STR1##其中R.sup.1为氢或较低的烷基,R.sup.2为羧基(较低)烷基或保护的羧基(较低)烷基,R.sup.3为--CH.dbd.N--R.sup.4,其中R.sup.4为芳基
脲基或芳基
硫脲基,X为--O--,或其药学上可接受的盐。