Synthesis and Crystal Structure Studies on 1N-Acetyl-3-Phenyl-5-(3,4,5-trimethoxyl-phenyl)-2-Pyrazoline

1N-Acetyl-3-phenyl-5-(3,4,5-trimethoxyl-phenyl)-2-pyrazoline has been synthesized and the crystal structure has been determined by means of single-crystal X-ray diffraction. The pyrazolinyl ring and the phenyl rings at 3 positions of the pyrazoline are almost coplane , with their dihedral angle to be 6.63(2) o. Phenyl ring at 5 positions and pyrazolinyl ring are almost perpendicular, the dihedral angle is 78.03(3) o.