The blooming of the French lilac
J. Clin. Invest. Lee A. Witters, et al. 108:1105 doi:10.1172/JCI14178 [Go to this article.]

Figure 1
The bloom of the French lilac. This blooming G. officinalis (Goat’s rue; French lilac; Italian fitch) is rich in guanidine. The plant’s long-recognized hypoglycemic properties led eventually to the synthesis of the biguanide compound metformin.