PROBLEM TO BE SOLVED: To provide a drug for preventing infectious diseases of non-human animals caused by Gram-negative bacteria and a feed containing the same. Providing drugs to prevent plant diseases caused by Gram-negative bacteria. SOLUTION: A culture of guadinamine represented by the following general formula (I) or a microorganism producing the same. In the general formula (I), R 1 is a hydrogen or hydroxy group. R 2 is an amino group or an acetyl amino group (-NH (C = O) CH 3 ) and R 3 is an amino group, but R 2 and R 3 may be combined to form a ring structure. .. [Selection diagram] None
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