US Patent 5,106,865
United States Patent and Trademark Office
The United States of America as represented by the Secretary of (Washington, DC) ; Biotechnology Research & Development Corporation (Peoria, IL) ; University of Iowa Research Foundation (Iowa City, IA, US)
Indole diterpene compounds named "radarin" have been isolated from the sclerotia of the fungus Aspergillus sulphureus. The radarins are effective for controlling Lepidopteran insects, and have the structures: ##STR1## wherein the compound formed when R is a hydroxyl group is designated radarin A and the compound formed when R is a hydrogen atom is designated radarin C; and ##STR2## wherein the compound formed when R is a hydrogen atom is designated radarin D and the compound formed when R is a hydroxyl group is designated radarin B.
Laakso, Jodi A.; Dowd, Patrick F.; Gloer, James B.; and Wicklow, Donald T. Radarin antiinsectan metabolites. US Patent 5,106,865 filed July 19, 1991 and issued April 21, 1992. https://ir.uiowa.edu/patents/92