22721-71-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 22721-71-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,2,7,2 and 1 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 22721-71:
(7*2)+(6*2)+(5*7)+(4*2)+(3*1)+(2*7)+(1*1)=87
87 % 10 = 7
So 22721-71-7 is a valid CAS Registry Number.