Showing structure for n-[(2z)-2-(butan-2-ylidene)-7,10-dihydroxy-5,11-dimethyl-3,12-dioxo-9-(pyridin-3-ylmethyl)-1,4-dioxa-8-azacyclododec-7-en-6-yl]-3-hydroxypyridine-2-carboximidic acid