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生物活性：Atopaxar hydrochloride (E5555 hydrochloride) 是 Atopaxar (HY-18200) 的盐酸盐形式。Atopaxar hydrochloride 口服活性有效的、可逆的凝血酶受体蛋白酶激活受体-1 (PAR-1) 选择性拮抗剂。Atopaxar hydrochloride 是 Janus 激酶 1 (JAK1) 和 JAK2 的抑制剂，在细胞 A549 中抑制 JAK-STAT 信号通路，EC₅₀ 为 5.90 μM。Atopaxar hydrochloride 可抑制 A549 细胞活力 (IC₅₀=7.02 μM)，在 G1 期阻滞细胞周期，并诱导细胞凋亡 (apoptosis)。Atopaxar hydrochloride 具有抗血小板和抗肿瘤作用。Atopaxar hydrochloride 可用于动脉粥样硬化血栓性疾病的研究。

Atopaxar hydrochloride (E5555 hydrochloride) is the hydrochloride salt form of Atopaxar (HY-18200). Atopaxar hydrochloride is an orally active, selective and reversible antagonist for thrombin receptor protease-activated receptor-1 (PAR-1). Atopaxar hydrochloride is the inhibitor for Janus kinase 1 (JAK1) and JAK2, which inhibits the JAK-STAT with EC₅₀ of 5.90 μM in A549. Atopaxar hydrochloride inhibits the cell viability of A549 (IC₅₀=7.02 μM), arrests the cell cycle at G1 phase and induces apoptosis. Atopaxar hydrochloride exhibits antiplatelet and antitumor activities. Atopaxar hydrochloride can be used for the research of atherothrombotic disease^[1][2][3].