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(+)-Osbeckic acid is a vasorelaxatant that can be isolated from Tartary Buckwheat. (+)-Osbeckic acid has a potent vasorelaxant effect in Sprague-Dawley rat thoracic aorta rings with an EC50 of 887 μM[1].

[1] Matsui T, et al. Identification of a new natural vasorelaxatant compound, (+)-osbeckic acid, from rutin-free tartary buckwheat extract. J Agric Food Chem. 2010 Oct 27;58(20):10876-9. DOI:10.1021/jf1028416