Nidulaxanthone A, a xanthone dimer with a heptacyclic 6/6/6/6/6/6/6 ring system from<i>Aspergillus</i>sp.-F029

Abstract

Nidulaxanthone A (<bold>1</bold>), a xanthone dimer bearing an unprecedented heptacyclic 6/6/6/6/6/6/6 system, together with a new monomeric nidulalin D (<bold>2</bold>) and four known analogues (<bold>3</bold>,<bold>4</bold>,<bold>5</bold>and<bold>6</bold>), were isolated from<italic>Aspergillus</italic>sp. F029.