2909: Ether and derivatives

290911: Diethyl ether 290919: Acyclic ethers nes, derivatives of acyclic ethers 290920: Cyclanic, cyclenic or cycloterpenic ethers and derivs 290930: Aromatic ethers, derivatives 290941: 2,2'-oxydiethanol(diethylene glycol) 290942: Monomethyl ethers of ethylene and diethylene glycol 290943: Monobutyl ethers of ethylene and diethylene glycol 290944: Monoalkyl ethers of ethylene, diethylene glycol, nes 290949: Ether-alcohols nes, derivatives of ether-alcohols 290950: Ether-phenols, ether-alcohol-phenols and derivatives 290960: Alcohol, ether, ketone peroxides, derivatives 2909: Ether and derivatives