NOVEL 4H-1-BENZOPYRAN-4-ON DERIVATIVE

NEW MATERIAL: A compound of formula I (R1 is H, a 1-6C alkyl, a 3-6C cycloalkyl, etc.; R2 is H, a 1-6C alkyl, an aryl, etc.; R3 is H, a 1-4C alkyl, hydroxyl, etc.; R4 is H, hydroxyl, a 1-4C alkoxy, etc.; R5 is H, a 1-6C alkyl, a 3-6C cycloalkyl, etc.; (m) is 0-3; (n) is 0-2) and an acid-added salt t...

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