Synonyms: 19,20,21-Trioxatetracyclo[14.2.1.14,7.110,13]heneicosa-2,4,6,8,10,12,14,16,18-nonaene(8CI,9CI); 19,20,21-Trioxatetracyclo[14.2.14,7.110,13]heneicosa-2,4,6,8,10,12,14,16,18-nonaene(7CI); 1,3,5,7,9,11,13,15,17-Cyclooctadecanonaene, 1,4:7,10:13,16-trioxide