Showing structure for 2-{1-[4,7,9b-trimethyl-1-oxo-3-(3-oxobut-1-en-1-yl)-2h,3h,3ah,5ah,6h,7h,8h,9h,9ah-cyclopenta[a]naphthalen-2-yl]-n-methylformamido}-3-hydroxypropanoic acid