Unfortunately, the formula Ag4H2P2O2 you provided is not the formula of an existing chemical compound. It seems that there has been an error in writing the formula.
When identifying a chemical compound, we need to consider the following factors: name, atomic mass, atomic weight, molecular and ionic structure, physical properties, chemical properties, related chemical equations, and compound synthesis methods.
For example, if we consider the chemical compound Ag2O (silver oxide), its English name is Silver(I) oxide, each molecule consists of 2 Ag atoms and 1 O atom. It has physical properties as a black, odorless solid that does not dissolve in water. Chemical properties include reacting with acid to form silver salts and water, and reacting with metals to create pure silver and new metal oxides.
I recommend you check the formula Ag4H2P2O2 again and provide accurate information so I can provide more detailed information about this compound.