Patent ID: 8431736

Claim:
A process for preparing a solid mixture of Forms I and IV of the disodium salt of N-(5-chlorosalicyloyl)-8-aminocaprylic acid comprising the step of cooling a solution of the disodium salt of N-(5-chlorosalicyloyl)-8-aminocaprylic acid and acetone for a sufficient time to precipitate the mixture of Forms I and IV, wherein the mixture exhibits an X-ray powder diffraction pattern having at least one peak in degrees 2Θ±0.2° 2Θ selected from 7.1, 10.4, 14.2, 15.0, 15.5, 16.1, 18.4, 20.9, 23.6, 24.1, 24.5, 24.9, 25.4, 26.6, 27.2, 27.5, 29.7 and 31.5 and at least one peak in degrees 2Θ±0.2° 2Θ selected from 7.1, 18.4 and 24.9.