... -tetramethyl-2-oxo-3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14, ... -tetramethyl-2-oxo-3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14, ... =1/C48H72O14.C47H70O14/c1-11-25(2)43-28(5)17-18-47(62-43)23-34- ... 12-11-13-31-23-54-44-39(48)28(6)18-34(45(50)57-33)47(31, ... )55-37/h12-15,17-19,25-26,28,30-31,33-45,49-50,52H,11, ... +;12-11+,26-14+,31-13+/t25-,26+,28+,30+,31+,33-,34+,35+,36+,37+,38+, ...