21919-65-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21919-65-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,9,1 and 9 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 21919-65:
(7*2)+(6*1)+(5*9)+(4*1)+(3*9)+(2*6)+(1*5)=113
113 % 10 = 3
So 21919-65-3 is a valid CAS Registry Number.