... Shim, Sang Hee; Swenson, Dale C.; Gloer, James B.; Dowd, Patrick F.; Wicklow, Donald T. Organic Letters (2006), 8 (6), 1225 ... In this paper also, penifulvins D and E were described. . ... II) was isolated as a 10-15% impurity of I. II was analogous to the solid product, m. 42°, isolated ...