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-2,4(9),10,15(24),16,18(23),21-heptaene