New isomerization of pyrimido[2,1-a]isoindole derivatives
F. S. Babichev1, V. A. Kovtunenko1, V. V. Ishchenko1, A. K. Tyltin1 and T. A. Yudina1
Chemistry of Heterocyclic Compounds Volume 21, Number 12 / December, 1985 page 1395
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http://dx.doi.org/10.1007/BF00842971