Ingenol

Chemical Name: (1aR,2S,5R,5aR,6S,8aS,9R,10aR)-5,5a,6-trihydroxy-4-(hydroxymethyl)-1,1,7,9-tetramethyl-1a,2,5,5a,6,9,10,10a-octahydro-1H-2,8a-methanocyclopenta[a]cyclopropa[e][10]annulen-11-one