Disclosed are: a novel compound which has an excellent antibacterial activity against a wide variety of pathogenic bacteria including drug-resistant bacteria and bacteria causing pneumonia in domestic livestock, a tautomer of the compound, or a salt of the compound or the tautomer; a method for producing the compound, the tautomer or the salt; and others. Specifically disclosed are: a compound characterized by being represented by structural formula (1), a tautomer of the compound, or a salt of the compound or the tautomer; a method for producing the compound, the tautomer or the salt, which is characterized by culturing a microorganism belonging to the genus