Composition and method for prevention, mitigation or treatment of an enteropathogenic bacterial infection

A compound or a hydrate, isomer, or pharmaceutically acceptable salt thereof having the structure:

• wherein
• R1 is C2-C6 alkyl;
• R2 is hydrogen, alkenyl, or oxo;
• X is —CHCH—, —NH—, —C═N—, or —N═C—;
• when X is —CHCH—, R2 is hydrogen, alkenyl, or oxo;
• when X is —NH—, —C═N—, or —N═C—, R2 is hydrogen, or oxo;
• n is 1-6.