PROBLEM TO BE SOLVED: To provide new crystalline forms of macrolide compounds, and pharmaceutical compositions thereof.SOLUTION: The present invention provides a composition containing CEM-101 (solithromycin), one of macrolide compounds, containing two crystalline forms (Form I and Form II), one of the crystalline forms being contained at the component ratio of 80:20 or more.SELECTED DRAWING: Figure 1【課題】マクロライド化合物の新規結晶形、及びこれらの結晶形の医薬組成物の提供。【解決手段】マクロライド化合物の一つであるCEM-101(ソリスロマイシン)を含有する組成物であって、2つの結晶形(結晶形I及び結晶形II)を含有し、前記各結晶形の一方が80:20又はそれ以上の構成比である組成物。【選択図】図1