5′-<i>Epi</i>-SPA-6952A, a new insecticidal 24-membered macrolide produced by S<i>treptomyces diastatochromogenes</i> SSPRC-11339

<p>A new 24-membered macrolide, 5′-<i>epi</i>-SPA-6952A (<b>1</b>), was isolated from the cultured broth of <i>Streptomyces diastatochromogenes</i>. The structure was elucidated by means of spectroscopic methods and comparing with literature data of the known 24-membered macrolide SPA-6952A. Compound <b>1</b> was found to show significant insecticidal activity against oriental armyworm(<i>Mythimna separata</i> Walker) with LC<sub>50</sub> value of 10.26 mg/L.</p>