Showing structure for 7,7,20,20-tetramethyl-8,12,19,25-tetraoxahexacyclo[12.11.0.0²,¹¹.0⁴,⁹.0¹⁵,²⁴.0¹⁸,²³]pentacosa-2(11),3,5,9,15,17,21,23-octaene