The present invention relates to the new crystalline compounds A of general formula I ##STR00001## wherein A.sup.1, A.sup.2, A.sup.3, X, Y.sup.1, Y.sup.2 and Y.sup.3 are defined as in claim 1, and which are present in the form of their physiologically acceptable salts with acids, the acids being selected from the group B comprising hydrochloric acid, hydrobromic acid, sulphuric acid, phosphoric acid, benzenesulphonic acid, p-toluenesulphonic acid, maleic acid, succinic acid, fumaric acid, D-(-)-tartaric acid, L-(+)-tartaric acid, naphthalene-2-sulphonic acid and naphthalene-1,5-disulphonic acid, and the polymorphs, the corresponding solvates and hydrates thereof.