7721-22-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 7721-22-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,2 and 1 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 7721-22:
(6*7)+(5*7)+(4*2)+(3*1)+(2*2)+(1*2)=94
94 % 10 = 4
So 7721-22-4 is a valid CAS Registry Number.