1,10-Diaza-4,7,13,16-tetraoxacyclooctadecane 1,4,10,13-Tetraoxa-7,16-diazacyclooctadecane 1,7,10,16-Tetraoxa-4,13-diazacyclooctadecane 23978-55-4 7,16-Diaza-1,4,10,13-tetraoxcyclooctadecane 7,16-Diaza-18-crown-6 97760-34-4 Cryptand 2.2 Cryptand 22 Diaza-18-crown-6 EINECS 245-965-0 Kryptofix 22 NSC 339325