The iron-salen complex according to claim 1, wherein R1 is a substituent which is the result of a hydrogen or a hydroxyl leaving any of the compounds of the following Formulas (1) to (27): (1): ibuprofen piconol, phenylpropionic acid analgesics/anti-inflammatories (2): mefenamic acid, anthranilic acid antipyretic anti-inflammatory analgesics (3) drugs for treating hyperlipemia (4): antibacterials