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Reference.org
Imidazolidinone
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<p>Imidazolidinones are a class of 5-membered ring <a href="/facts/Heterocycle/8oYSjJxY">heterocycles</a> structurally related to <a href="/facts/Imidazolidine/WWoFvV8U">imidazolidine</a>. Imidazolidinones feature a saturated C3N2 nucleus, except for the presence of a <a href="/facts/Urea/6j84AoCG">urea</a> or <a href="/facts/Amide/C6kCzYEA">amide</a> <a href="/facts/Functional_group/GXkSPsjM">functional group</a> in the 2 or 4 positions. </p>