221087-71-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221087-71-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,0,8 and 7 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 221087-71:
(8*2)+(7*2)+(6*1)+(5*0)+(4*8)+(3*7)+(2*7)+(1*1)=104
104 % 10 = 4
So 221087-71-4 is a valid CAS Registry Number.