1. Garry M. Coppola, Herbert F. Schuster. The Chemistry of 2H-3,1-Benzoxazine-2,4(1H)-dione (Isatoic Anhydride). 21. A Mild Process For The Preparation of 10-Alkyl-9-acridanones And It's Application To The Synthesis of Acridone Alkaloids.
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https://www.jhetchem.com/login.php?file=19890957Journal of Pharmaceutical Sciences, 1994, 83, 11, p. 1578-1581
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http://dx.doi.org/10.1002/jps.2600831112