Showing structure for 5,7,17,19-tetraoxa-13-azahexacyclo[11.11.0.0²,¹⁰.0⁴,⁸.0¹⁵,²³.0¹⁶,²⁰]tetracosa-1(24),2,4(8),9,15(23),16(20),21-heptaene