(E)-2,3,4,5,5-Pentachloro-1-phenyl-penta-2,4-dien-1-ol, also known as pentachlorophenol (PCP), is a synthetic organic compound with the chemical formula C6HCl5O. It is a white crystalline solid that is highly toxic and has been widely used as a pesticide, wood preservative, and herbicide. PCP is known for its persistence in the environment, bioaccumulation in organisms, and potential to cause adverse health effects in humans and animals, including endocrine disruption and cancer. Due to its hazardous nature, its production and use have been restricted or banned in many countries.
The CAS Registry Mumber 5659-42-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,6,5 and 9 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 5659-42: (6*5)+(5*6)+(4*5)+(3*9)+(2*4)+(1*2)=117 117 % 10 = 7 So 5659-42-7 is a valid CAS Registry Number.