Sodium metatungstate

Sodium metatungstate (Sodium polyoxotungstate) is a potent inhibitor of ecto-nucleoside triphosphate diphosphohydrolase (NTPDase), with Ki values of 2.58 μM for NTPDase 1, 3.26 μM for NTPDase 3, and 28.8 μM for NTPDase 2.

O=[W+4]1234[O-2][W+4]567([O-2][W+4]89%10([O-2][W+4]%11%12([O-2]1)([O-2][W+4]%13([O-2]8)([O-2][W+4]%14%15%16([O-2][W+4]%17([O-2]2)([O-2]%11)([O-2][W+4]%18([O-2][W+4]([O-2]3)([O-2]5)([O-2][W+4]%19%20([O-2][W+4]%21([O-2]6)([O-2]9)([O-2][W+4]([O-2]%13)([O-2]%14)([O-2]%19)([OH-]%21%20)=O)=O)([O-2]%18)=O)([O-2]47)=O)([O-2]%15)([OH-]%17%16)=O)=O)=O)([O-2]%12%10)=O)=O)=O)=O.[Na+].[Na+].[Na+].[Na+].[Na+].[Na+]