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Yoshiko Miyamoto, Chiji Yamazaki. Synthesis of nitrogen-containing heterocycles 6†. Formation and structures of imidazolinones and related compounds through cyclization of diaminomethylenehydrazones with dimethyl acetylenedicarboxylate. Journal of Heterocyclic Chemistry Volume 31, Issue 6, pages 1445–1448, November/December 1994
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http://dx.doi.org/10.1002/jhet.5570310626
