... tetramethyl-2-oxo-3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene-6-spiro-2 ... -2-oxo-3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene-6-spiro-2 ... -34-20-33(61-47)16-15-27(4)42(26(3)13-12-14-32-24-55-45-40(49 ... 17-46(61-41)22-33-19-32(60-46)15-14-26(4)42(25(3)12-11-13-31-23 ... -44,48-49,51H,15,19-23H2,1-10H3/b13-12+,27-15+,32-14+;12-11+,26-14+,31-13+/t25-,26 ...