Cyclo-oxygenase-1-selective inhibitor SC-560.

Area of Science:

• Medicinal Chemistry
• Crystallography
• Pharmacology

Background:

• SC-560 is a selective cyclooxygenase-1 (COX-1) inhibitor.
• Understanding the three-dimensional structure of drug molecules is crucial for optimizing their pharmacological properties.
• Crystal structure analysis provides precise geometric information about molecular conformation.

Purpose of the Study:

• To determine the crystal structure of 5-(4-chloro-phenyl)-1-(4-methoxy-phenyl)-3-(trifluoro-methyl)-1H-pyrazole (SC-560).
• To analyze the dihedral angles between the pyrazole heterocycle and the substituted phenyl rings.
• To investigate intermolecular interactions in the crystal lattice of SC-560.

Main Methods:

• Single-crystal X-ray diffraction was used to elucidate the molecular structure.
• Geometric parameters, including dihedral angles, were precisely measured.
• Analysis of intermolecular forces was performed based on crystal packing.

Main Results:

• The dihedral angles between the pyrazole ring and the chlorobenzene ring were 41.66(6)°, and with the methoxybenzene ring were 43.08(7)°.
• The dihedral angle between the two phenyl rings was determined to be 59.94(6)°.
• No classical hydrogen bonds were observed; dispersion forces dominate intermolecular interactions.

Conclusions:

• The determined crystal structure provides detailed geometric insights into SC-560.
• The observed molecular conformation and intermolecular interactions may influence the drug's behavior in vivo.
• This structural information can guide the design of drug delivery systems for enhanced oral bioavailability.