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The structures of a chalcone and of its cyclocondensation product with guanidine are reported. In (2E)‐3‐(6‐methoxynaphthalen‐2‐yl)‐1‐(pyridin‐3‐yl)prop‐2‐en‐1‐one, C19H15NO2, (I), the planes of the pyridine and naphthalene units make dihedral angles with that of the central spacer unit of 23.61 (13) and 23.57 (15)°, respectively, and a dihedral angle of 47.24 (9)° with each other. The molecules of...
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