2-Pyridinecarboxylic acid, 1,4-dihydro-3-hydroxy-6-(((4-hydroxy-7-methoxy-2-oxo-2H-1-benzopyran-3-yl)amino)carbonyl)-4-oxo-, 4,5,6,7,8,9,10,13-octahydro-8,14-dihydroxy-6,10,12,15-tetramethyl-1,7,13,18-tetraoxo-2,6-epoxy-3,17-methano-1H-4-benzazacyclopentadecin-9-yl ester