Synonyms: 4,13,22,31,37,38,39,40-Octaoxapentacyclo[32.2.1.17,10.116,19.125,28]tetracontane-3,12,21,30-tetrone,2,5,11,14,20,23,29,32-octamethyl-,[1R-(1R*,2R*,5R*,7R*,10S*,11S*,14S*,16S*,19R*,20R*,23R*,25R*,28S*,29S*,32S*,34S*)]-(8CI); Nonactin (6CI,7CI);4,13,22,31,37,38,39,40-Octaoxapentacyclo[32.2.1.17,10.116,19.125,28]tetracontane,nonactin deriv.; Ammonium ionophore I; NSC 52141; NSC 56409;[1R-(1R*,2R*,5R*,7R*,10S*,11S*,14S*,16S*,19R*,20R*,23R*,25R*,28S*,29S*,32S*,34S*)]-2,5,11,14,20,23,29,32-Octamethyl-4,13,22,31,37,38,39,40-octaoxapentacyclo[32.2.1.17,10.116,19.125,28]tetracontane-3,12,21,30-tetrone