| abstract |
Claim 1: A Form-I crystal of 2- {4- [N- (5,6-diphenylpyrazin-2-yl) -N-isopropylamino] butyloxy} -N- (Methylsulfonyl) acetamide, which exhibits diffraction peaks in its X-ray powder diffraction spectrum at the following 2theta diffraction angles: 9.4 degrees, 17.2 degrees and 19.4 degrees, where the powder X-ray diffraction diagram is obtained using CuKalfa radiation. Claim 2: A Form-II crystal of 2- {4- [N- (5,6-diphenylpyrazin-2-yl) -N-isopropylamino] butyloxy} -N- (Methylsulfonyl) acetamide, which exhibits diffraction peaks in its X-ray powder diffraction spectrum at the following 2theta diffraction angles: 9.0 degrees, 20.7 degrees and 22.6 degrees, in the powder X-ray diffraction spectrum of the compound, where the diffraction diagram X-ray powder is obtained using CuKalfa radiation. Claim 3: A Form-III crystal of 2- {4- [N- (5,6-diphenylpyrazin-2-yl) -N-isopropylamino] butyloxy} -N- (Methylsulfonyl) acetamide, which exhibits diffraction peaks in its X-ray powder diffraction spectrum at the following 2theta diffraction angles: 9.3 degrees, 16.8 degrees, 20.6 degrees and 23.5 degrees, in the powder X-ray diffraction spectrum of the compound, where The powder X-ray diffraction diagram is obtained using CuKalfa radiation. |