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In the title ester derivative, C28H29NO6·0.5H2O, the 1,4-dihydropyridine ring has a flattened boat conformation. The mean plane is almost perpendicular to the attached benzene ring, making a dihedral angle of 86.87 (9)°. The terminal phenyl ring is inclined to the central benzene ring by 67.56 (12)°. In the crystal, molecules are bridged via O—H
O hydrogen bonds involving the partially occupied water molecule, and this arrangement is strengthened by a pair of N—HO hydrogen bonds and C—HO interactions. The ethyl atoms of one of the ethyl ester groups are disordered over two sites with an occupancy ratio of 0.716 (5):0.284 (5).
O hydrogen bonds involving the partially occupied water molecule, and this arrangement is strengthened by a pair of N—HO hydrogen bonds and C—HO interactions. The ethyl atoms of one of the ethyl ester groups are disordered over two sites with an occupancy ratio of 0.716 (5):0.284 (5).organic compoundsOpen access
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In the title compound, C18H19BrO4, the aromatic rings enclose a dihedral angle of 81.9 (7)°. There are no short directional contacts in the crystal structure.
organic compoundsOpen access
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In the title compound, C32H25NO5, the furan and pyrrole rings each adopt an envelope conformation, the respective flap atoms being the C atom bearing the pyrene substituent and the CH2 atom adjacent to the N atom. The molecular conformation is stabilized by an intramolecular O—HN hydrogen bond. In the crystal, C—HO contacts link the molecules, forming a two-dimensional network parallel to (001).
N hydrogen bond. In the crystal, C—HO contacts link the molecules, forming a two-dimensional network parallel to (001).organic compoundsOpen access
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In the title compound, C30H29BrN2O5, the β-lactam ring is essentially planar, with the O atom displaced from this plane by 0.856 (9) Å, and forming dihedral angles of 24.35 (13) and 89.42 (14)° with the planes of the benzene substituent groups on this ring. The tetrahydropyran ring adopts an envelope conformation with the C atom bearing the β-lactam ring as the flap. In the crystal, weak C—HO hydrogen bonds with carboxyl and tetrahydropyran O-atom acceptors give rise to a chain structure extending along the b-axis direction.
O hydrogen bonds with carboxyl and tetrahydropyran O-atom acceptors give rise to a chain structure extending along the b-axis direction. 
