_EC 3.6.1.- In phosphorous-containing anhydrides. 995 PDB entries  
EC 3.-.-.- Hydrolases. [21,051 PDB entries]
EC 3.6.-.- Acting on acid anhydrides. [2,179 PDB entries]
EC 3.6.1.- In phosphorous-containing anhydrides. [995 PDB entries]    
EC 3.6.1.1 Inorganic diphosphatase. [88 PDB entries]
EC 3.6.1.2 Trimetaphosphatase. [-]
EC 3.6.1.3 Adenosinetriphosphatase. [10 PDB entries]
EC 3.6.1.4 Transferred entry: 3.6.1.3. [-]
EC 3.6.1.5 Apyrase. [3 PDB entries]
EC 3.6.1.6 Nucleoside diphosphate phosphatase. [4 PDB entries]
EC 3.6.1.7 Acylphosphatase. [30 PDB entries]
EC 3.6.1.8 Atp diphosphatase. [2 PDB entries]
EC 3.6.1.9 Nucleotide diphosphatase. [11 PDB entries]
EC 3.6.1.10 Endopolyphosphatase. [-]
EC 3.6.1.11 Exopolyphosphatase. [11 PDB entries]
EC 3.6.1.12 dCTP diphosphatase. [4 PDB entries]
EC 3.6.1.13 ADP-ribose diphosphatase. [15 PDB entries]
EC 3.6.1.14 Adenosine-tetraphosphatase. [-]
EC 3.6.1.15 Nucleoside-triphosphate phosphatase. [571 PDB entries]
EC 3.6.1.16 CDP-glycerol diphosphatase. [1 PDB entries]
EC 3.6.1.17 Bis(5'-nucleosyl)-tetraphosphatase (asymmetrical). [9 PDB entries]
EC 3.6.1.18 Fad diphosphatase. [-]
EC 3.6.1.19 Nucleoside-triphosphate diphosphatase. [20 PDB entries]
EC 3.6.1.20 5'-acylphosphoadenosine hydrolase. [-]
EC 3.6.1.21 ADP-sugar diphosphatase. [-]
EC 3.6.1.22 NAD(+) diphosphatase. [2 PDB entries]
EC 3.6.1.23 dUTP diphosphatase. [98 PDB entries]
EC 3.6.1.24 Nucleoside phosphoacylhydrolase. [-]
EC 3.6.1.25 Triphosphatase. [3 PDB entries]
EC 3.6.1.26 CDP-diacylglycerol diphosphatase. [4 PDB entries]
EC 3.6.1.27 Undecaprenyl-diphosphate phosphatase. [1 PDB entries]
EC 3.6.1.28 Thiamine-triphosphatase. [3 PDB entries]
EC 3.6.1.29 Bis(5'-adenosyl)-triphosphatase. [11 PDB entries]
EC 3.6.1.30 Transferred entry: 3.6.1.59 and 3.6.1.62. [-]
EC 3.6.1.31 Phosphoribosyl-ATP diphosphatase. [5 PDB entries]
EC 3.6.1.32 Transferred entry: 3.6.4.1. [-]
EC 3.6.1.33 Transferred entry: 3.6.4.2. [-]
EC 3.6.1.34 Transferred entry: 3.6.3.14. [5 PDB entries]
EC 3.6.1.35 Transferred entry: 3.6.3.6. [-]
EC 3.6.1.36 Transferred entry: 3.6.3.10. [-]
EC 3.6.1.37 Transferred entry: 3.6.3.9. [-]
EC 3.6.1.38 Transferred entry: 3.6.3.8. [2 PDB entries]
EC 3.6.1.39 Thymidine-triphosphatase. [-]
EC 3.6.1.40 Guanosine-5'-triphosphate,3'-diphosphate diphosphatase. [-]
EC 3.6.1.41 Bis(5'-nucleosyl)-tetraphosphatase (symmetrical). [2 PDB entries]
EC 3.6.1.42 Guanosine-diphosphatase. [-]
EC 3.6.1.43 Dolichyldiphosphatase. [-]
EC 3.6.1.44 Oligosaccharide-diphosphodolichol diphosphatase. [-]
EC 3.6.1.45 UDP-sugar diphosphatase. [9 PDB entries]
EC 3.6.1.46 Transferred entry: 3.6.5.1. [-]
EC 3.6.1.47 Transferred entry: 3.6.5.2. [-]
EC 3.6.1.48 Transferred entry: 3.6.5.3. [-]
EC 3.6.1.49 Transferred entry: 3.6.5.4. [-]
EC 3.6.1.50 Transferred entry: 3.6.5.5. [-]
EC 3.6.1.51 Transferred entry: 3.6.5.6. [-]
EC 3.6.1.52 Diphosphoinositol-polyphosphate diphosphatase. [4 PDB entries]
EC 3.6.1.53 Mn(2+)-dependent ADP-ribose/CDP-alcohol diphosphatase. [1 PDB entries]
EC 3.6.1.54 UDP-2,3-diacylglucosamine diphosphatase. [1 PDB entries]
EC 3.6.1.55 8-oxo-dGTP diphosphatase. [23 PDB entries]
EC 3.6.1.56 2-hydroxy-dATP diphosphatase. [9 PDB entries]
EC 3.6.1.57 UDP-2,4-diacetamido-2,4,6-trideoxy-beta-L-altropyranose hydrolase. [2 PDB entries]
EC 3.6.1.58 8-oxo-dGDP phosphatase. [9 PDB entries]
EC 3.6.1.59 5'-(N(7)-methyl 5'-triphosphoguanosine)-(mRNA) diphosphatase. [8 PDB entries]
EC 3.6.1.60 Diadenosine hexaphosphate hydrolase (AMP-forming). [1 PDB entries]
EC 3.6.1.61 Diadenosine hexaphosphate hydrolase (ATP-forming). [3 PDB entries]
EC 3.6.1.62 5'-(N(7)-methylguanosine 5'-triphospho)-(mRNA) hydrolase. [9 PDB entries]
EC 3.6.1.63 Alpha-D-ribose 1-methylphosphonate 5-triphosphate diphosphatase. [-]
EC 3.6.1.64 Inosine diphosphate phosphatase. [-]
EC 3.6.1.65 (d)CTP diphosphatase. [1 PDB entries]
EC 3.6.1.66 XTP/dITP diphosphatase. [-]
EC 3.6.1.n1 D-tyrosyl-tRNA(Tyr) hydrolase. [-]
EC 3.6.1.n2 L-cysteinyl-tRNA(Pro). [-]
EC 3.6.1.n3 L-cysteinyl-tRNA(Cys) hydrolase. [-]
EC 3.6.1.n4 Dihydroneopterin triphosphate diphosphatase. [-]
EC 3.6.1.n5 Transferred entry: 3.6.1.54. [-]

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