Dibenzo-24-crown-8
2,3,5,6,8,9,11,12-Octahydrobenzo[b][1,4,7,10,13]pentaoxacyclopentadecine-15-carboxylic acid
Benzo-12-crown-4
Benzo-15-crown-5
2,3,5,6,8,9,11,12,14,15-Decahydrobenzo[b][1,4,7,10,13,16]hexaoxacyclooctadecine-18-carboxylic acid
Di-(tert-butylbenzo)-18-crown-6
