21811-71-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21811-71-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,8,1 and 1 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21811-71:
(7*2)+(6*1)+(5*8)+(4*1)+(3*1)+(2*7)+(1*1)=82
82 % 10 = 2
So 21811-71-2 is a valid CAS Registry Number.