Structures of a New Dihydroxanthone Derivative, Nidulalin A, and a New Benzophenone Derivative, Nidulalin B, from Emericella nidulans

Abstract

Two new compounds, designated nidulalins A (1) and B (2), were isolated along with emestrin and sterigmatocystin from the extract of rice culture of Emericella nidulans var. lata. The structures of nidulalins A (1) and B (2) were determined on the basis of chemical and spectroscopic investigation and X-ray crystallographic study, together with the application of the modiifed Mosher's method.