Keith Brewster, Raymond J. Clarke, John M. Harrison, Thomas D. Inch and David Utley
Preparation of the eight monohydroxydibenz[b,f][1,4]oxazepin-11(10H)-ones
J. Chem. Soc., Perkin Trans. 1, 1976, 1286 - 1290,
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http://dx.doi.org/10.1039/P19760001286