Abstract
Abeo-nodulisporisteroid A (1), an abnormal steroid with a rearranged C3 chain at C-9 possibly derived from seco-ring A via Wagner-Meerwein rearrangement and oxidations, was obtained from Nodulisporium sp. together with five related new seco-progesteroids (nodulisporisteroids M-Q, 2–6), which were elucidated by the extensive spectroscopic analysis and X-ray crystallography. A plausible biosynthetic pathway of 1–6 was also proposed. Furthermore, these isolated compounds were also evaluated for cytotoxicities against five human tumour cell lines, antimicrobial activities, and inhibitions against PI3K gamma, Aβ42 aggregation, and α-glucosidase.
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