... -tetramethyl-2-oxo-3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene-6-spiro ... tetramethyl-2-oxo-3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene-6-spiro ... -21-36(53-9)41(50)30(7)56-38;1-24(2)41-27(5)16-17-46(61-41)22 ... 45,49-50,52H,11,16,20-24H2,1-10H3;11-14,16-18,24-25,27,29-30,32-44,48 ... -49,51H,15,19-23H2,1-10H3/b13-12+,27 ...