8 alpha-acetoxy-1 alpha-hydroxy-3 alpha,4 alpha-epoxy-5 alpha,7 alpha H-9,11(13)-guaiadien-12,6 alpha-olide
8 alpha-acetoxy-1 alpha-hydroxy-3 alpha,4 alpha-epoxy-5 alpha,7 alpha h-9,11(13)-guaiadien-12,6 alpha-olide