The invention relates to stable crystal modifications of (R,S)-, (R)- and (S)-DOPC, to a process for the preparation of these modifications, and to the use thereof as constituent for the preparation of medicaments.本發明係關於(R,S)-、(R)-及(S)-DOPC之穩定結晶改質物,製備該等改質物之方法,及其作為醫藥製備之成分的用途。