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J. Am. Chem. Soc., Tetsuji Kametani, Chu Van Loc, Terumi Higa, Masuo Koizumi, Masataka Ihara, Keiichiro Fukumoto, "Iminoketene cycloaddition. 2. Total syntheses of arborine, glycosminine, and rutecarpine by condensation of iminoketene with amides", 1977, 99 (7), pp 2306–2309
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dx.doi.org/10.1021/ja00449a047