Norman H. Cromwell, David J. Pokorny, Robert Loerch, Jan Kasperbauer
5,6-Dimethylbenz[c]acridine functionalized in the 7-position
Journal of Heterocyclic Chemistry Volume 16, Issue 4, pages 699–704, June 1979
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http://dx.doi.org/10.1002/jhet.5570160417