_EC 3.5.2.- In cyclic amides. 625 PDB entries  
EC 3.-.-.- Hydrolases. [21,051 PDB entries]
EC 3.5.-.- Acting on carbon-nitrogen bonds, other than peptide bonds. [1,670 PDB entries]
EC 3.5.2.- In cyclic amides. [625 PDB entries]    
EC 3.5.2.1 Barbiturase. [-]
EC 3.5.2.2 Dihydropyrimidinase. [9 PDB entries]
EC 3.5.2.3 Dihydroorotase. [41 PDB entries]
EC 3.5.2.4 Carboxymethylhydantoinase. [-]
EC 3.5.2.5 Allantoinase. [2 PDB entries]
EC 3.5.2.6 Beta-lactamase. [532 PDB entries]
EC 3.5.2.7 Imidazolonepropionase. [6 PDB entries]
EC 3.5.2.8 Transferred entry: 3.5.2.6. [-]
EC 3.5.2.9 5-oxoprolinase (ATP-hydrolyzing). [-]
EC 3.5.2.10 Creatininase. [12 PDB entries]
EC 3.5.2.11 L-lysine-lactamase. [-]
EC 3.5.2.12 6-aminohexanoate-cyclic-dimer hydrolase. [2 PDB entries]
EC 3.5.2.13 2,5-dioxopiperazine hydrolase. [-]
EC 3.5.2.14 N-methylhydantoinase (ATP-hydrolyzing). [-]
EC 3.5.2.15 Cyanuric acid amidohydrolase. [8 PDB entries]
EC 3.5.2.16 Maleimide hydrolase. [-]
EC 3.5.2.17 Hydroxyisourate hydrolase. [12 PDB entries]
EC 3.5.2.18 Enamidase. [1 PDB entries]
EC 3.5.2.19 Streptothricin hydrolase. [-]

[-] signifies that there are no PDB entries for the given enzyme subclass