n. (Chem.) A glucoside found in the seeds of several species of lupine, and extracted as a yellowish white crystalline substance. [ 1913 Webster ]

n. (Chem.) An alkaloid found in several species of lupine (Lupinus luteus, Lupinus albus, etc.), and extracted as a bitter crystalline substance, having a formula C10H19NO. Called also l-lupinine [ 1913 Webster ]

Chemically it is a a bicyclic saturated quinolizine [ 1-R-trans ]-Octahydro-2H-quinolizine-1-methanol, with the structure:
CH2OH | /\ H /\ / \|/ \ | | | | N | \ / \ / \/ \/
[ MI11 ] [ PJC ]