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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
(A) Representative structures of quinazolinone derivatives as anticancer agents previously reported. (B) Some biologically active molecules containing a pyrazolo-[1,5-c]quinazolinone skeleton. (C) The design idea and synthesis strategy of the pyrazolo-[1,5-c]quinazolinone skeleton.