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In the title compound, C14H15N3O4S, the tetra­hydro­pyrimidine ring adopts a half-boat form. There are inter­molecular N—H⋯O hydrogen bonds and π–π stacking inter­actions. [ABSTRACT FROM AUTHOR]

The title compound, C21H24O6, is the reduced form of curcumin, and exhibits important cosmoceutical properties. The molecule is non-planar and the benzene rings positioned at the ends of the heptane chain are orthogonally placed, with a dihedral angle of 84.09 (7)° between them. The molecular geometry and H-atom locations reveal that the 'heptane-3,5dione' moiety exists in the keto-enol form, with the hydroxy H atom disordered over two adjacent sites. The packing of the molecules in the lattice is directed by strong O-H···O intermolecular hydrogen bonds, which generate two-dimensional sheets. These sheets are linked by C-H···O hydrogen bonds and weak C-H···π interactions to develop a threedimensional network. [ABSTRACT FROM AUTHOR]

The crystal structure of the title compound, C17H20N2O5, is stabilized by C—H...O and N—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]