The IUPAC name of Pyrophosphoric acid is phosphono dihydrogen phosphate. With the CAS registry number 2466-09-3, it is also named as Diphosphoric acid. The product's category is API Intermediates. It is white to very pale yellow glassy solid which is soluble in water, diethyl ether, and ethyl alcohol. And it is a medium strong inorganic acid which is corrosive. What's more, it is produced from phosphoric acid by dehydration. Additionally, this chemical should be sealed in the container and stored in the cool and dry place.

The other characteristics of this product can be summarized as: (1)ACD/LogP: -3.42; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -7.96; (4)ACD/LogD (pH 7.4): -8.64; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)#H bond acceptors: 7; (8)#H bond donors: 4; (9)#Freely Rotating Bonds: 2; (10)Polar Surface Area: 99.91 Å²; (11)Index of Refraction: 1.56; (12)Molar Refractivity: 23.68 cm³; (13)Molar Volume: 73.2 cm³; (14)Polarizability: 9.38×10^-24 cm³; (15)Surface Tension: 166.3 dyne/cm; (16)Rotatable Bond Count: 2; (17)Exact Mass: 177.943226; (18)MonoIsotopic Mass: 177.943226; (19)Topological Polar Surface Area: 124; (20)Heavy Atom Count: 9; (21)Complexity: 147.

Uses of Pyrophosphoric acid: It is used as a catalyst and as stabilizer in metal refining and organic peroxide. It is also used as analytical reagents, such as masking agent for the preparation of organic phosphate. What's more, it can be used in the process of electroplating copper, adjusting the pH value of plating solution. In addition, this chemical can also be used in other electroplating. 

When you are using this chemical, please be cautious about it as the following:
It is harmful if swallowed. And it also can cause burns. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. If you want to contact this product, you must wear suitable protective clothing, gloves and eye/face protection. In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)

People can use the following data to convert to the molecule structure. 
1. SMILES:O=P(O)(O)OP(=O)(O)O
2. InChI:InChI=1/H4O7P2/c1-8(2,3)7-9(4,5)6/h(H2,1,2,3)(H2,4,5,6)
3. InChIKey:XPPKVPWEQAFLFU-UHFFFAOYAX

The following are the toxicity data which has been tested.