Showing structure for 3-{[(1r,3r)-3-(carboxymethyl)-10-hydroxy-7-(methylamino)-1-(3-methylbutyl)-6,9-dioxo-1h,3h,4h-naphtho[2,3-c]pyran-8-yl]sulfanyl}-2-[(1-hydroxyethylidene)amino]propanoic acid