Showing structure for (2e,6s)-6-[(3r,3ar,5as,6s,7z,9ar,9bs)-6-(2-carboxyethyl)-7-(1-carboxyethylidene)-3a,5a,9b-trimethyl-octahydro-1h-cyclopenta[a]naphthalen-3-yl]-2-methylhept-2-enoic acid