3alpha,8alpha-dihydroxy-1alphaH,5alphaH,6betaH,7alphaH,11betaH-guai-4(15),10(14)-dien-6,12-olide 8-O-2-hydroxymethylacrylate
3alpha,8alpha-dihydroxy-1alphah,5alphah,6betah,7alphah,11betah-guai-4(15),10(14)-dien-6,12-olide 8-o-2-hydroxymethylacrylate