Instructions: In this task, you're given a paragraph from the research paper and your task is to generate a suitable title for the research paper based on the given paper. Under 100 words is a good title length.
Input: From an aqueous decoction of the traditional Chinese medicine "ban lan gen" (the Isatis indigotica root), an antiviral natural product CI -39 was isolated as an NNRTI (non-nucleoside reverse transcriptase inhibitor) (EC 50 3.40 mM). Its novel structure was determined as methyl (1-methoxy-1H-indol-3-yl) acetamidobenzoate by spectroscopic data and confirmed by single crystal X-ray diffraction. Through synthesis and structure-activity relationship (SAR) investigation of CI -39 and 57 new derivatives (24 with EC 50 values of 0.06e8.55 mM), two optimized derivatives 10f and 10i (EC 50 : 0.06 mM and 0.06 mM) having activity comparable to that of NVP (EC 50 0.03 mM) were obtained. Further evaluation verified that 10f and 10i were RT DNA polymerase inhibitors and exhibited better activities and drug resistance folds compared to NVP against seven NNRTI-resistant strains carrying different mutations. Especially, 10i (EC 50 0.43 mM) was more active to the L100I/K103N double-mutant strain as compared to both NVP (EC 50 0.76 mM) and EFV (EC 50 1.08 mM). The molecular docking demonstrated a possible binding pattern between 10i and RT and revealed activity mechanism of 10i against the NNRTI-resistant strains. a Chemical shift values (d) were measured at 500 MHz for 1 H and at 125 MHz for 13 C, respectively. Proton coupling constants (J) in Hz are given in parentheses. The assignments were based on DEPT, 1 He 1 H COSY, HSQC, and HMBC experiments. C. Xu et al.
Output:
Discovery, synthesis, and optimization of an N-alkoxy indolylacetamide against HIV-1 carrying NNRTI-resistant mutations from the Isatis indigotica root