(57) A process for producing an antibiotic, which comprises cultivating an antibiotic
KA-6606-producing strain of the genus Saccharopolyspora in a nutrient culture medium,
isolating the antibiotic KA-6606-containing substance from the culture broth, and
separating from the resulting antibiotic KA-6606-containing substance at least one
antibiotic selected from the group consisting of antibiotic KA-6606 VII, KA-6606 VIII,
KA-6606 IX, KA-6606 X, KA-6606 XI, KA-6606 XII, KA-6606 XIII, KA-6606 XIV, KA-6606
XV, KA-6606 XVI and KA-6606 XVII; and novel antibiotics KA-6606 XII, XIII and XV to
XVII.
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