Chaetoindicins A-C, three isoquinoline alkaloids from the fungus Chaetomium indicum

Chaetoindicins A−C (1−3), three isoquinolines with novel skeletons, were isolated from the solid-state fermented culture of Chaetomium indicum. Their structures were elucidated on the basis of spectral data. X-ray crystallographic analysis confirmed the structure of 2.