Definition: 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: Design, synthesis and biological evaluation of a series of 5-chloropyridine ester-derived severe acute respiratory syndrome-coronavirus chymotrypsin-like protease inhibitors is described. Position of the carboxylate functionality is critical to potency. Inhibitor 10 with a 5-chloropyridinyl ester at position 4 of the indole ring is the most potent inhibitor with a SARS 3Clpro IC 50 value of 30 nM and antiviral EC 50 value of 6.9 μM. Molecular Docking studies have provided possible binding modes of these inhibitors.

Design, Synthesis and Antiviral Efficacy of a Series of Potent Chloropyridyl Ester-derived SARS-CoV 3CLpro Inhibitors NIH Public Access Author Manuscript