[molecular_function] 5'-(N(7)-methyl 5'-triphosphoguanosine)-[mRNA] diphosphatase activity <sep> 5'-(N(7)-methylguanosine 5'-triphospho)-[mRNA] hydrolase activity <sep> bis(5'-adenosyl)-hexaphosphatase activity <sep> bis(5'-adenosyl)-pentaphosphatase activity <sep> diphosphoinositol-polyphosphate diphosphatase activity <sep> endopolyphosphatase activity <sep> inositol diphosphate pentakisphosphate diphosphatase activity <sep> inositol diphosphate tetrakisphosphate diphosphatase activity <sep> inositol-3,5-bisdiphosphate-2,3,4,6-tetrakisphosphate 5-diphosphatase activity <sep> inositol-5-diphosphate-1,2,3,4,6-pentakisphosphate diphosphatase activity <sep> magnesium ion binding <sep> manganese ion binding <sep> zinc ion binding