19‐<i>O</i>‐Acetylchaetoglobosin B and 19‐<i>O</i>‐Acetylchaetoglobosin D, Two New Metabolites of <i>Chaetomium globosum</i>

Abstract

Abstract Two new metabolites have been isolated from cultures of Chaetomium globosum . The structures of 19‐ O ‐acetylchaetoglobosin B ( 4 ) and 19‐ O ‐acetylchaetoglobosin D ( 5 ) are assigned. The 13 C‐NMR. spectra of chaetoglobosin A ( 1 ), 19‐ O ‐acetylchaetoglobosin A ( 2 ), chaetoglobosin C ( 3 ), 19‐ O ‐acetylchaetoglobosin B ( 4 ), 19‐ O ‐acetylchaetoglobosin D ( 5 ) and of cytochalasin G ( 6 ), a (3‐indolyl)‐[11]cytochalasan isolated from Pseudeurotium zonatum , have been interpreted.