Magn Reson Chem. 2013 Jan;51(1):65-8. doi: 10.1002/mrc.3903. Epub 2012 Nov 22.

Three new xanthone derivatives from an algicolous isolate of Aspergillus wentii.

Sun RR, Miao FP, Zhang J, Wang G, Yin XL, Ji NY.

Abstract

Three new xanthone derivatives, yicathin A (1), yicathin B (2), and yicathin C (3), and three known anthraquinone derivatives, alatinone (4), 1,5-dihydroxy-3-methoxy-7-methylanthraquinone (5), and 5-hydroxy-1,3-dimethoxy-7-methylanthraquinone (6), were isolated from the cultures of Aspergillus wentii pt-1, an endophytic fungus isolated from the marine red alga Gymnogongrus flabelliformis. Their structures were unambiguously elucidated by NMR and mass spectroscopic methods as well as quantum chemical calculations. Compound 2 was active against Escherichia coli, and 3 could inhibit E. coli, Staphylococcus aureus, and Colletotrichum lagenarium.