Patent ID: 6071916
Filing Date: 2000-06-06
Classification: C07D

Abstract:
A crystalline compound of the formula ##STR21## wherein the crystalline compound is characterized by (i) a differential scanning calorimetry (DSC) curve, at a heating rate of 10.degree. C./min in an open cup under flowing nitrogen exhibiting an endotherm with an extrapolated onset temperature of about 190.degree. C., a peak temperature of about 193.degree. C. and an associated heat of about 120 J/gm and (ii) an X-ray powder diffraction pattern with d-spacings of 11.72, 5.56, 5.20, 5.00, 4.60, 4.50, 4.40, 4.26, 4.17, 4.08, 3.90, 3.81, 3.69, 3.24 and 3.33 .ANG..