The Tetrapotassium peroxydiphosphate, with the CAS registry number 15593-49-4, is also known as Peroxydiphosphoric acid, tetrapotassium salt. Its EINECS number is 239-665-9. This chemical's molecular formula is H₄O₈P₂·4 K and molecular weight is 346.34. What's more, its systematic name is tetrapotassium (oxido-oxidooxy-phosphoryl) phosphate. This chemical should be sealed and stored in a cool and dry place. It is used for subgingival irrigation. 

Physical properties of Tetrapotassium peroxydiphosphate are: (1)ACD/LogP: -2.968; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -7.51; (4)ACD/LogD (pH 7.4): -8.19; (5)ACD/BCF (pH 5.5): 1.00; (6)ACD/BCF (pH 7.4): 1.00; (7)#H bond acceptors: 8; (8)#H bond donors: 4; (9)#Freely Rotating Bonds: 4; (10)Polar Surface Area: 153.14 Å².

When you are using this chemical, please be cautious about it as the following:
This chemical can cause burns. If contact with combustible material, it may cause fire, so you should keep it away from combustible material. It is toxic by inhalation, in contact with skin and if swallowed. In case of contact with eyes, you should rinse immediately with plenty of water and seek medical advice. When using it, you need to wear suitable protective clothing, gloves and eye/face protection. In case of accident or if you feel unwell, you must seek medical advice immediately (show the label where possible).

You can still convert the following datas into molecular structure:
(1)SMILES: [K+].[K+].[K+].[K+].[O-]P(=O)([O-])OP([O-])(=O)O[O-]
(2)Std. InChI: InChI=1S/4K.H4O8P2/c;;;;1-7-10(5,6)8-9(2,3)4/h;;;;1H,(H,5,6)(H2,2,3,4)/q4*+1;/p-4
(3)Std. InChIKey: PEKPGBKEIWFPAS-UHFFFAOYSA-J