(5-chloro-lH-pyrrolo [2,3-b] pyridin-3-ylmethyl) -pyridine, which is a compound that is active against receptor protein kinase c-Kit and / or c-Fms and / or Flt3 2-yl] - (6-trifluoromethyl-pyridin-3-ylmethyl) -amine HCl salt (Compound I) and its free base was prepared and characterized: A method of using the solid form is also provided.수용체 단백질 키나제 c-Kit 및/또는 c-Fms 및/또는 Flt3에 대해 활성인 화합물인 [5-(5-클로로-1H-피롤로[2,3-b]피리딘-3-일메틸)-피리딘-2-일]-(6-트리플루오로메틸-피리딘-3-일메틸)-아민 HCl 염(화합물 I) 및 이의 유리 염기의 고형 형태가 제조되었고, 특성규명되었다:상기 고형 형태를 사용하는 방법이 또한 제공된다.