Mizuhara T, Oishi S, Ohno H, Shimura K, Matsuoka M, Fujii N.

Structure-activity relationship study of pyrimido[1,2-c][1,3]benzothiazin-6-imine derivatives for potent anti-HIV agents.

Bioorg Med Chem. 2012 Nov 1;20(21):6434-41. doi: 10.1016/j.bmc.2012.08.030. Epub 2012 Aug 30. PMID: 23022280.

https://pubmed.ncbi.nlm.nih.gov/23022280/