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http://dx.doi.org/10.1002/jhet.5570330403doi:10.1002/jhet.5570330403
Condensation reactions of benzils with ureas in ethylene glycol
Authors: Chang Kiu Lee, Sun Hee Kim, Yong Bun Kim
Journal of Heterocyclic Chemistry Volume 33 Issue 4, Pages 1019 - 1024