Showing structure for 8,12,17,21-tetraoxaheptacyclo[13.11.0.0²,¹⁴.0³,¹¹.0⁵,⁹.0¹⁸,²⁶.0²⁰,²⁴]hexacosa-3(11),4,6,9,18(26),19,22,24-octaene-13,16-dione