21673-65-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21673-65-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,6,7 and 3 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 21673-65:
(7*2)+(6*1)+(5*6)+(4*7)+(3*3)+(2*6)+(1*5)=104
104 % 10 = 4
So 21673-65-4 is a valid CAS Registry Number.