A scroll type compressor includes a housing, a movable scroll member, a plurality of compression chambers, a discharge port, a communication passage and a relief valve. The modified catalyst can be used for stereo-, chemo- and regioselective transformations of organic compounds. Treatment and prophylactic strategies targeted at the elaborated psychopathology are also disclosed. A scraper is movably attached between the mount and the duct. In the thus-configured outer retainer, at least three window portions are disposed between the elastic member and the cut-away portion adjacent to the elastic member in the peripheral direction.