- 48 - NEW CRYSTALLINE FORMS ABSTRACT THERE ARE PROVIDED CRYSTALLINE FORMS OF THE COMPOUNDS PH(3-CL)(5-OCHF2)- 5 (R)CH(OH)C(O)-AZE-PAB(OME) AND PH(3-CL)(5-OCHF2)-(R)CH(OH)C(O)-AZE-PAB(OH), PHARMACEUTICAL COMPOSITIONS CONTAINING THEM, PROCESSES FOR OBTAINING THEM AND THEIR USE IN MEDICAL TREATMENT.