2821-91-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 2821-91-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,8,2 and 1 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 2821-91:
(6*2)+(5*8)+(4*2)+(3*1)+(2*9)+(1*1)=82
82 % 10 = 2
So 2821-91-2 is a valid CAS Registry Number.