Compounds of general formula (I') wherein X has the meaning of C-R 1, wherein R 1 is selected from the group consisting of: - hydrogen, - halogen, - optionally substituted alkyl, - optionally substituted alkoxy R 2 and R 3 are the same or different and are each selected from the group consisting of: - hydrogen, - hydroxyl, - halogen, - carboxyl, - sulfonic acid residue (-SO 3 H), - optionally substituted aminocarbonyl, - optionally substituted aminosulfonyl, - optionally substituted amino, - optionally substituted alkyl, - optionally substituted acyl, - optionally substituted alkoxycarbonyl, - optionally substituted acyloxy, - optionally substituted alkoxy - optionally substituted alkenyl, - optionally substituted alkynyl, - optionally substituted aryl, - optionally substituted heterocyclyl; R 4 and R 5 are the same or different and are each selected from the group consisting of: - hydrogen, - optionally substituted amino, - optionally substituted alkyl-, aryl- or heterocyclylsulfonyl, - optionally substituted alkyl, - optionally substituted alkenyl, - optionally substituted alkynyl, - optionally substituted acyl, - optionally substituted aryl, - optionally substituted heterocyclyl or - wherein R 4 and R 5, together with the nitrogen atom to which they are bound, form a saturated or unsaturated, optionally substituted 3- to 8-membered ring, which can optionally contain further heteroatoms; or pharmaceutically acceptable salts thereof, for the use in the treatment of iron metabolism disorders. X has the meaning of C-R 1, wherein R 1 is selected from the group consisting of: - hydrogen, - halogen, - optionally substituted alkyl, - optionally substituted alkoxy - hydrogen, - halogen, - optionally substituted alkyl, - optionally substituted alkoxy R 2 and R 3 are the same or different and are each selected from the group consisting of: - hydrogen, - hydroxyl, - halogen, - carboxyl, - sulfonic acid residue (-SO 3 H), - optionally substituted aminocarbonyl, - optionally substituted aminosulfonyl, - optionally substituted amino, - optionally substituted alkyl, - optionally substituted acyl, - optionally substituted alkoxycarbonyl, - optionally substituted acyloxy, - optionally substituted alkoxy - optionally substituted alkenyl, - optionally substituted alkynyl, - optionally substituted aryl, - optionally substituted heterocyclyl; - hydrogen, - hydroxyl, - halogen, - carboxyl, - sulfonic acid residue (-SO 3 H), - optionally substituted aminocarbonyl, - optionally substituted aminosulfonyl, - optionally substituted amino, - optionally substituted alkyl, - optionally substituted acyl, - optionally substituted alkoxycarbonyl, - optionally substituted acyloxy, - optionally substituted alkoxy - optionally substituted alkenyl, - optionally substituted alkynyl, - optionally substituted aryl, - optionally substituted heterocyclyl; R 4 and R 5 are the same or different and are each selected from the group consisting of: - hydrogen, - optionally substituted amino, - optionally substituted alkyl-, aryl- or heterocyclylsulfonyl, - optionally substituted alkyl, - optionally substituted alkenyl, - optionally substituted alkynyl, - optionally substituted acyl, - optionally substituted aryl, - optionally substituted heterocyclyl or - wherein R 4 and R 5, together with the nitrogen atom to which they are bound, form a saturated or unsaturated, optionally substituted 3- to 8-membered ring, which can optionally contain further heteroatoms; - hydrogen, - optionally substituted amino, - optionally substituted alkyl-, aryl- or heterocyclylsulfonyl, - optionally substituted alkyl, - optionally substituted alkenyl, - optionally substituted alkynyl, - optionally substituted acyl, - optionally substituted aryl, - optionally substituted heterocyclyl or - wherein R 4 and R 5, together with the nitrogen atom to which they are bound, form a saturated or unsaturated, optionally substituted 3- to 8-membered ring, which can optionally contain further heteroatoms;