Showing structure for 10-[9-butyl-8-(4-carboxy-3-methylbuta-1,3-dien-1-yl)-9-[(4-methoxy-4-oxobut-2-enoyl)oxy]-3-methyl-1,7-dioxaspiro[5.5]undecan-2-yl]-5-hydroxy-4,8-dimethyldeca-2,6,8-trienoic acid