_EC 3.3.-.- Acting on ether bonds. 120 PDB entries  
EC 3.-.-.- Hydrolases. [21,057 PDB entries]
EC 3.3.-.- Acting on ether bonds. [120 PDB entries]    
EC 3.3.1.- Thioether and trialkylsulfonium hydrolases. [27 PDB entries]
EC 3.3.2.- Ether hydrolases. [93 PDB entries]