4(3H)-Quinazolinone is a building block in chemical synthesis. Biologically active nitrogen heterocyclic compounds. Possesses a wide spectrum of biological properties like antibacterial, antifungal, anticonvulsant, anti-inflammatory, anti-HIV, anticancerous and analgesic activities[1][2].

References:
[1]. Jafari E, et al. Quinazolinone and quinazoline derivatives: recent structures with potent antimicrobial and cytotoxic activities. Res Pharm Sci. 2016 Jan-Feb;11(1):1-14.
[2]. Hameed A, et al. Quinazoline and quinazolinone as important medicinal scaffolds: a comparative patent review (2011-2016). Expert Opin Ther Pat. 2018 Apr;28(4):281-297.