221539-51-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221539-51-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,5,3 and 9 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 221539-51:
(8*2)+(7*2)+(6*1)+(5*5)+(4*3)+(3*9)+(2*5)+(1*1)=111
111 % 10 = 1
So 221539-51-1 is a valid CAS Registry Number.