To provide new crystalline forms of macrolide compounds, and uses thereof.SOLUTION: A composition contains CEM-101, where CEM-101 of crystalline form I is contained such that a composition ratio between CEM-101 of crystalline form I and CEM-101 of crystalline form II is 80:20 or more. Also provided are pharmaceutical compositions containing CEM-101, uses thereof, and processes for preparing the crystalline forms.SELECTED DRAWING: Figure 1【課題】マクロライド化合物の新規結晶形およびその使用の提供。【解決手段】CEM-101を含有する組成物であって、結晶形IのCEM-101と結晶形IIのCEM-101の構成比が80:20又はそれ以上の構成比で結晶形Iを含有する、組成物。また、CEM-101を含む医薬組成物、その使用、これらの結晶形を調製するプロセス。【選択図】図1