A minor alkaloid was isolated from Crotalaria assamica, and its structure was determined by spectroscopic methods as the 9-O-(γ-lactone) of ', 3 -dimethyl-4' -hydroxypen-tane-2',3'-dicarboxyl)-retronecine [1]. The new alkaloid was named assamicadine. © 1989, American Chemical Society. All rights reserved.