Attribution-Share Alike 4.0 truetrue English Degradation of metformin to guanylurea German Abbau von Metformin zu Guanylharnstoff URL: https://commons.wikimedia
DescriptionMetformin synthesis.svg English: Chemical synthesis of metformin, as reported by Seymour L. Shapiro et al. in 1959. Dimethylamine (1) and 2-cyanoguanidine