Showing structure for (1s,13r)-5,7,11,14,18-pentaoxahexacyclo[11.11.0.0²,¹⁰.0⁴,⁸.0¹⁵,²³.0¹⁷,²¹]tetracosa-2,4(8),9,15(23),16,19,21-heptaen-24-one