_EC 3.1.6.- Sulfuric ester hydrolases. 12 PDB entries  
EC 3.-.-.- Hydrolases. [20,839 PDB entries]
EC 3.1.-.- Acting on ester bonds. [5,948 PDB entries]
EC 3.1.6.- Sulfuric ester hydrolases. [12 PDB entries]    
EC 3.1.6.1 Arylsulfatase. [1 PDB entries]
EC 3.1.6.2 Steryl-sulfatase. [1 PDB entries]
EC 3.1.6.3 Glycosulfatase. [-]
EC 3.1.6.4 N-acetylgalactosamine-6-sulfatase. [2 PDB entries]
EC 3.1.6.5 Deleted entry. [-]
EC 3.1.6.6 Choline-sulfatase. [-]
EC 3.1.6.7 Cellulose-polysulfatase. [-]
EC 3.1.6.8 Cerebroside-sulfatase. [7 PDB entries]
EC 3.1.6.9 Chondro-4-sulfatase. [-]
EC 3.1.6.10 Chondro-6-sulfatase. [-]
EC 3.1.6.11 Disulfoglucosamine-6-sulfatase. [-]
EC 3.1.6.12 N-acetylgalactosamine-4-sulfatase. [1 PDB entries]
EC 3.1.6.13 Iduronate-2-sulfatase. [-]
EC 3.1.6.14 N-acetylglucosamine-6-sulfatase. [-]
EC 3.1.6.15 N-sulfoglucosamine-3-sulfatase. [-]
EC 3.1.6.16 Monomethyl-sulfatase. [-]
EC 3.1.6.17 D-lactate-2-sulfatase. [-]
EC 3.1.6.18 Glucuronate-2-sulfatase. [-]
EC 3.1.6.19 (R)-specific secondary-alkylsulfatase. [-]

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