Showing structure for 21-hydroxy-2,21-bis(methoxycarbonyl)-5,7-dioxa-2,15-diazaheptacyclo[17.2.2.1¹²,¹⁵.0¹,¹².0³,¹¹.0⁴,⁸.0¹⁹,²⁴]tetracosa-3(11),4(8),9-trien-15-ium-15-olate