Medicament having anti-inflammatory bowel disease function, and preparation method therefor and application thereof

A method for treating an inflammatory bowel disease, comprising administering to a patient a medicament having an anti-inflammatory bowel disease effect, wherein the medicament comprises a compound with the structure represented by Formula I or Formula II

• wherein R1 and R2 are each independently selected from any one of hydrogen, ethyl, n-propyl, n-butyl, isopropyl, allyl, isobutyl, t-butyl, benzyl, acetyl, a sulfonic acid group, a phosphoric acid group, a benzoic acid group, a benzamido group, a benzoylcyclopropylamino group, a benzenesulfonic acid group, a picolinamido group, a picolinoylcyclopropylamino group, a pyrimidinecarboxamido group, or a cyclopropylpyrimidinecarboxamido group;
• R3 is selected from any one of hydrogen, acetyl, a sulfonic acid group, or a phosphoric acid group;
• and
• in Formula I, R1, R2, and R3 are not hydrogen at the same time;
• R1, R2, and R3 are not acetyl at the same time;
• and R1 and R2 are not benzyl at the same time;
• and in Formula II, R1 and R2 are not hydrogen or benzyl at the same time, or a hydrate or pharmaceutically-acceptable salt thereof.