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Chemical structures of protease inhibitors: (A) lopinavir, (B) ritonavir, (C) nelfinavir, (D) cinanserin, (E) betulinic acid, (F) savinin, (G) dieckol, (H) herbacetin, (I) 6-mercaptopurine, (J) 6-thioguanine, (K) disulfiram, (L) danoprevir, and (M) darunavir.
