Laprafylline is a xanthine compound with inhibitory effects on bronchoconstriction in vivo and antitumor activity.Laprafylline acts as a competitive serotonergic antagonist at low concentrations, and inhibits constriction induced by hist at high difficulties.

Apiopaeonoside 是从牡丹根中分离出来的天然产物。

GS-621763 是 GS-441524 的前药，对 SARS-CoV-2 发病机制具有抗病毒活性。