Pyridine, 2-bromo-5-ethyl-4-methyl- is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 152191-20-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,2,1,9 and 1 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 152191-20: (8*1)+(7*5)+(6*2)+(5*1)+(4*9)+(3*1)+(2*2)+(1*0)=103 103 % 10 = 3 So 152191-20-3 is a valid CAS Registry Number.