Keywords: Grayanotoxins.svg General chemical structures of grayanotoxins Own 15 06 3 January 2012 UTC Ed Edgar181 wikitable - Grayantoxin R<sup>1</sup> R<sup>2</sup> R<sup>3</sup> - Grayantoxin I OH CH<sub>3</sub> H - Grayantoxin II 2 align center CH<sub>2</sub> H - Grayantoxin III OH CH<sub>3</sub> Ac - Grayantoxin IV 2 align center CH<sub>2</sub> Ac Ac acetyl Grayanotoxins |