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The synthesis and isolation of some O ‐acylisoureas are described. The reaction between dicyclohexyl‐carbodiimide and coumarin‐3‐carboxylic acids leads to coumarin‐dicyclohexylisourea derivatives, isolated as the main products, and to coumarin‐dicyclohexylurea derivatives as byproducts.
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Bonsignore et al. (1995) studied this question.
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