.beta.,.beta.'-Dimorpholinodiethyl ether 2,2'-Dimorpholinodiethyl ether 4,4'-(Oxydiethylene)bis[morpholine] 6425-39-4 Bis(morpholinoethyl)ether Dimorpholinodiethyl ether Morpholine, 4,4'-(oxydi-2,1-ethanediyl)bis- Morpholine, 4,4'-(oxydiethylene)di- NSC28749