221677-64-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221677-64-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,6,7 and 7 respectively; the second part has 2 digits, 6 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 221677-64:
(8*2)+(7*2)+(6*1)+(5*6)+(4*7)+(3*7)+(2*6)+(1*4)=131
131 % 10 = 1
So 221677-64-1 is a valid CAS Registry Number.