Austrocortinin: Crystal structure of a natural anthraquinone pigment from fungi

A natural anthraquininoid pigment, austrocortinin (1,4-dihydroxy-2-methoxy-7-methylanthracene-9,10-dione, C16H12O5), was isolated from Fungi K_BK5, a novel endophytic fungus of Lagerstroemia speciosa. The pigment is monoclinic in P21/c with a = 8.6758(2) Å, b = 7.9050 (2) Å, c = 18.6415 Å, β = 97.099(1)°, V = 1268.67(6) Å3, and Z = 4.