T-705RTP sodium and T-705RMP are detected in MDCK cells treated with T-705. influenza virus RNA polymerase activity in a dose-dependent and a GTP-competitive manner inhibited by T-705RTP sodium[1]. T-705RTP inhibits the incorporation of ATP and GTP in a competitive manner (Ki of 7.72 and 1.56 μM, respectively). T-705RTP inhibits the incorporation of CTP in a mixed-type manner(Ki of 11.3 μM), and also inhibits the incorporation of UTP in a noncompetitive manner[2]. The incorporation of a single molecule of T-705RTP (10-1000 μM) inhibits influenza virus RNA strand extension[2].