14187-32-7 Crown 18 Crown-18 Dibenzo-18-crown-6 Dibenzo-18-crown-6-ether Dibenzo[b,k][1,4,7,10,13,16]hexaoxacyclooctadecane Dibenzo[b,k][1,4,7,10,13,16]hexaoxacyclooctadecin, 6,7,9,10,17,18,20,21-octahydro- Dibenzocrown NSC147771