An X-ray crystallographic study of 6-menthyl-2,4-diphenyldihydropyrimidine (1) has shown that in the solid state it exists in the 1,4-dihydro-form (1a) with a flat boat conformation, as a single tautomeric entity.
A. Weis and F. Frolow, J. Chem. Soc., Chem. Commun., 1982, 89 DOI: 10.1039/C39820000089
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