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The title compound, C(19)H(20)O(6), crystallizes in the centrosymmetric space group P2(1)/c with one molecule in the asymmetric unit. The molecule is approximately planar and the dihedral angle between the phenyl rings is 11.0 (1) degrees. The H atoms of the central propenone group are trans. There is an intramolecular O-H.O hydrogen bond and the molecules are crosslinked by four intermolecular C-H.O hydrogen bonds, producing a three-dimensional network.

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Antibiotics such as norfloxacin and ciprofloxacin are used to treat numerous bacterial infections. The present research work involves the molecular prediction, synthesis, characterization and in vitro antimicrobial activities of molecular hybrids of norfloxacin and ciprofloxacin. First set of compounds involve the substitutions of various amines at third position of ciprofloxacin and norfloxacin. On the other hand, second set of molecular hybrids include the substitution of different amines at seventh position along with linker (─COCH 2 ─). These synthesized compounds were identified by TLC technique and well characterized by various spectroscopic techniques such as IR, NMR,and ESI-MS. Molecular prediction of these newly synthesized compounds have been carried out using the SwissADME, ADMETLab software. Their cytotoxic-

2,3-Epoxy-2-hydroxy-1-indanone (epoxide) has been detected as a primary photoproduct in the photolysis of 3-hydroxy-2-phenyl-4H-chromen-4-one (3HF).