The present invention relates to calcium salts of compounds of the general formula (I) wherein X is selected from the group consisting of CH 2 , S, or O D isOorS R 8 is hydrogen or alkyl E is an optionally substituted phenylene group Y is a monocyclic or bicyclic substituted or unsubstituted 6-9 membered ring system which may contain one or more heteroatoms selected from N or S and which contains at least one aromatic ring n is 0 or 1, and q is 0 or 1 with the proviso that compounds wherein X = CH 2 , q =0 , Y= unsubstituted phenyl and E = unsubstituted phenylene are excluded or a hydrate thereof.
