8221-55-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 8221-55-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 8,2,2 and 1 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 8221-55:
(6*8)+(5*2)+(4*2)+(3*1)+(2*5)+(1*5)=84
84 % 10 = 4
So 8221-55-4 is a valid CAS Registry Number.