Abstract
The cytochalasan asporychalasin (1) was obtained from the marine fungus Aspergillus oryzae, isolated from the Red Sea sediments collected off Jeddah, Saudi Arabia. The chemical structure of 1 was elucidated by extensive spectroscopic analysis and quantum-mechanical calculations of 13C NMR resonances and ECD to possess an unprecedented 6/6/11-fused tricyclic skeleton, including an isoquinolindione ring in place of the typical isoindolone. Asporychalasin exhibited moderate antiproliferative activity against three human cancer cell lines, lung carcinoma (A549), liver carcinoma (HepG2), and breast carcinoma (MCF7), and no toxicity on zebrafish embryos.
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