Toll Biotech Co.Ltd.(Beijing)

The goal of this study is to evaluate the safety, pharmacokinetic (PK) characteristics, and preliminary efficacy of a new oral chemical drug in : adults aged 18-70 years (male or female) with moderate to severe active rheumatoid arthritis (RA), who have had inadequate response to or intolerance of at least one conventional synthetic disease-modifying antirheumatic drug (csDMARDs) .
Participants will take the assigned study drug (either tollB-001 Tablets or placebo) once daily orally for 4 weeks, follow up for 1 week.

The primary objective is to evaluate the safety and tolerability of TollB-001 following the administration of single or multiple oral doses in healthy adult subjects

主要目的：评价TollB-001 片在SSc 患者中的有效性。 次要目的：评价TollB-001 片在SSc 患者中的安全性、药代动力学（PK）特征及其他有效性指标。 探索性目的：评价TollB-001 片在SSc 患者中的药效动力学（PD）特征、SSc 患者中的生物标志物及皮肤超声较基线变化。