Alternaphenol B2, a new IDH1 inhibitor from the coral-derived fungus Parengyodontium album SCSIO SX7W11.

A new aromatic polyketide, alternaphenol B2 ( 1 ), and four known compounds ( 2-5 ) were isolated from the coral - derived fungus Parengyodontium album SCSIO SX7W11. Their structures were elucidated by high-resolution mass spectrometry, 1D and 2D NMR spectroscopy and comparison with reported literatures. Compounds 1 and 2 exhibited selective inhibitory activity against isocitrate dehydrogenase mutant R132H (IDH1m), with IC 50 values of 41.9 and 27.7 μM, respectively. Our findings thus provide a fresh incentive for investigation on IDH1m inhibitors as lead compounds for cancer treatment.