1,1,1,2,2-pentachloro-3,3-bis-(4-chloro-phenyl)-propane, commonly known as pentachlorophenol (PCP), is a highly toxic, white crystalline chemical compound with the molecular formula C13H5Cl7O. It was widely used as a pesticide, herbicide, and wood preservative due to its broad-spectrum effectiveness against various pests and fungi. PCP is known for its persistence in the environment, bioaccumulation in living organisms, and potential to cause severe health issues, including cancer, reproductive and developmental problems, and damage to the immune and nervous systems. Due to its hazardous nature, the production and use of PCP have been banned or restricted in many countries.
The CAS Registry Mumber 899-07-0 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 8,9 and 9 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 899-07: (5*8)+(4*9)+(3*9)+(2*0)+(1*7)=110 110 % 10 = 0 So 899-07-0 is a valid CAS Registry Number.