Abstract: [Problem] To provide a method for detecting high-risk prostate cancer, for the purpose of providing useful information, such as necessity of biopsy, to a test-positive patient in a PSA test. [Solution] The method for detecting high-risk prostate cancer according to the present invention comprises reacting a PSA contained in a sample composed of urine collected from a human body which is suspected to be suffering from prostate cancer with (1) a fucose ?1?6 affinitive lectin which has a characteristic property that the lectin has affinity expressed by a binding constant of 1.0×104 M?1 or more (at 25° C.) for an ?1?6 fucose sugar chain No. 405. The fucose ?1?6 affinitive lectin is preferably (2) a fucose ?1?6 specific lectin which has a characteristic property that the lectin has a binding constant of 1.0×104 M?1 or less (at 25° C.) for a sugar chain No. 003 that does not contain ?1?6 fucose and a glycolipid-type sugar chain No. 909 that does not contain ?1?6 fucose.

Abstract: An antimicrobial agent comprising, as an active component, compounds represented by the following formula [wherein, R1 and R2 each independently represent H or an alkali metal atom.]; and a microbicidal agent comprising, as an active component, compounds represented by formula (I): [wherein, R1 and R2 each independently represent H or an alkali metal atom.], wherein they have high safety and little impact on the environment.