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In the title compound, C15H13NS, the thia-zine ring adopts a boat conformation. The dihedral angle between the planes of the benzene ring of the benzo-thia-zine unit and the tolyl ring is 19.52 (9)°. In the crystal, mol-ecules are linked by weak C-H⋯π inter-actions into a tape structure along the b-axis direction.

Synthesis of a series of urea/thiourea/acetamide/sulphonamide derivatives of quinazolinones conjugated lysine has been reported. Structures of the products have been determined by standard spectroscopical studies. All the compounds have been screened for their antibacterial studies and structure-activity relationship has been developed. The activity profile revealed that the compounds containing urea and thiourea functionalities along with fluoro group have exerted a highly potent activity. Thus, the title compounds represent a novel class of potent antimicrobial agents., (Copyright © 2011 Elsevier Masson SAS. All rights reserved.)