6672-20-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 6672-20-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,6,7 and 2 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 6672-20:
(6*6)+(5*6)+(4*7)+(3*2)+(2*2)+(1*0)=104
104 % 10 = 4
So 6672-20-4 is a valid CAS Registry Number.