... 11,13,22-tetramethyl-2-oxo-3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14 ... 11,13,22-tetramethyl-2-oxo-3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14 ... 12-14-32-24-55-45-40(49)29(6)19-35(46(51)58-34)48(32,45)52 ... 27(5)16-17-46(61-41)22-33-19-32(60-46)15-14-26(4)42( ... 40(49)29(7)55-37/h12-15,17-19,25-26,28,30-31,33-45,49-50 ... 27,29-30,32-44,48-49,51H,15,19-23H2,1-10H3/b13-12+,27-15+,32-14 ...