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(A) The crystal structure of 1 with TGEV 3CLpro (PDB ID 1P9U) and superimposed 2 with HRV2 3Cpro (PDB ID 1CQQ). The protein binding pocket is shown in surface representation (pink color). The carbon color of compounds 1 (B), 2 (C), and the binding pocket residues of TGEV 3CLpro and HRV2 3Cpro are represented in magenta, green, and dark- and light-gray, respectively. Oxygen atoms are colored in red, nitrogen atoms in blue, sulfur atoms in yellow and hydrogen atoms in white.
