Tetsuji Kametani, Yukio Suzuki and Toshio Honda
Synthesis of a morphinan from a benzocyclobutene derivative. X-Ray structure of 3,3-ethylenedioxy-1,2,3,4,4a,10a-hexahydro-6,7-dimethoxy-phenanthrene-4a-carbonitrile
J. Chem. Soc., Perkin Trans. 1, 1986, 1373 - 1377
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http://dx.doi.org/10.1039/P19860001373