257631-22-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 257631-22-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,7,6,3 and 1 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 257631-22:
(8*2)+(7*5)+(6*7)+(5*6)+(4*3)+(3*1)+(2*2)+(1*2)=144
144 % 10 = 4
So 257631-22-4 is a valid CAS Registry Number.