Showing structure for 7-[3-hydroxy-2a-(4-hydroxybutanoyl)-5-(1h-indol-3-ylmethyl)-6,6a-dimethyl-1ah,2h,5h,5ah,6h-oxireno[2,3-f]isoindol-2-yl]-2,4-dimethylhepta-2,6-dienal