Three novel polyether antibiotics X-14889A, C, and D from a streptomycete. Taxonomy of the producing organism, fermentation production and biological properties of the antibiotics.

Antibiotic X-14889A, C, and D are novel polyether antibiotics related to lysocellin and antibiotic X-14873A. They are produced by a streptomycete isolated from a soil of Wisconsin. The antibiotic X-14889C is active against Gram-positive bacteria and exhibits ionophore property.