Compounds of general formula I; ##STR1## wherein: A.sup.1 is .dbd.N--, .dbd.CH-- or .dbd.CR.sup.1 --; A.sup.2 is .dbd.N--, .dbd.CH-- or .dbd.CR.sup.2 --; provided that, when one of A.sup.1 and A.sup.2 is a nitrogen atom, the other of A.sup.1 and A.sup.2 is other than a nitrogen atom; wherein the rest of the variables are defined in the specification; and their pharmaceutically and veterinarily acceptable acid addition salts and hydrates are antagonists of platelet activating factor (PAF) and as such are useful in the treatment or amelioration of various diseases or disorders mediated by PAF.
通式I的化合物;其中:A.sup.1是.dbd.N--,.dbd.CH--或.dbd.CR.sup.1--; A.sup.2是.dbd.N--,.dbd.CH--或.dbd.CR.sup.2--; 前提是,当A.sup.1和A.sup.2中的一个是
氮原子时,另一个不是
氮原子; 其中其余的变量在规范中定义; 它们的药学和兽医可接受的酸盐和
水合物是血小板活化因子(PAF)的
拮抗剂,因此可用于治疗或改善由PAF介导的各种疾病或障碍。