A compound of formula or formula wherein A, B, C and D, which may be the same or different, independent of one another represent -C(R 7 R 8 )-, -C(R 9 R 10 )-C(R 11 R 12 )- , -N(R 13 )-, -O- or -S- with the proviso that the total number of ring atoms of the ring comprising ring members A, B, C and D is 7 to 9, R 1 is selected from the group consisting of OH, OR 3 , NH 2 , NHR 4 and NR 5 R 6 R 2 is a substituted or unsubstituted alkyl group with 1 to 8 carbon atoms or a substituted or unsubstituted alkoxy group with 1 to 8 carbon atoms in which one or more of the hydrogen atoms may be optionally replaced by halogen, R 3 and R 4 , independent of each other, represent an alkyl group with 1 to 6 carbon atoms or a substituted or unsubstituted alkylaryl, aryl or heteroaryl group, R 5 and R 6 , independent of each other, represent an alkyl group with 1 to 6 carbon atoms or a substituted or unsubstituted aryl or heteroaryl group or form together with the nitrogen atom to which they are attached, a six- or seven membered, substituted or unsubstituted heterocyclic ring, R 7 to R 13 , independent of each other, represent hydrogen, hydroxyl, substituted or unsubstituted alkyl groups with 1 to 4 carbon atoms, substituted or unsubstituted alkoxy groups with 1 to 4 carbon atoms and substituted or unsubstituted hydroxyalkyl groups with 1 to 4 carbon atoms or wherein two of R 7 to R 13 located at adjacent atoms, form together a chemical bond or a ring, R 14 represents a substituted or unsubstituted aryl or heteroaryl group, and R 15 and R 16 , independent of each other, are hydrogen or a C 1 to C 4 -alkyl group. A, B, C and D, which may be the same or different, independent of one another represent -C(R 7 R 8 )-, -C(R 9 R 10 )-C(R 11 R 12 )- , -N(R 13 )-, -O- or -S- with the proviso that the total number of ring atoms of the ring comprising ring members A, B, C and D is 7 to 9, R 1 is selected from the group consisting of OH, OR 3 , NH 2 , NHR 4 and NR 5 R 6 R 2 is a substituted or unsubstituted alkyl group with 1 to 8 carbon atoms or a substituted or unsubstituted alkoxy group with 1 to 8 carbon atoms in which one or more of the hydrogen atoms may be optionally replaced by halogen, R 3 and R 4 , independent of each other, represent an alkyl group with 1 to 6 carbon atoms or a substituted or unsubstituted alkylaryl, aryl or heteroaryl group, R 5 and R 6 , independent of each other, represent an alkyl group with 1 to 6 carbon atoms or a substituted or unsubstituted aryl or heteroaryl group or form together with the nitrogen atom to which they are attached, a six- or seven membered, substituted or unsubstituted heterocyclic ring, R 7 to R 13 , independent of each other, represent hydrogen, hydroxyl, substituted or unsubstituted alkyl groups with 1 to 4 carbon atoms, substituted or unsubstituted alkoxy groups with 1 to 4 carbon atoms and substituted or unsubstituted hydroxyalkyl groups with 1 to 4 carbon atoms or wherein two of R 7 to R 13 located at adjacent atoms, form together a chemical bond or a ring, R 14 represents a substituted or unsubstituted aryl or heteroaryl group, and R 15 and R 16 , independent of each other, are hydrogen or a C 1 to C 4 -alkyl group. <EOS>