20840-12-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20840-12-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,8,4 and 0 respectively; the second part has 2 digits, 1 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 20840-12:
(7*2)+(6*0)+(5*8)+(4*4)+(3*0)+(2*1)+(1*2)=74
74 % 10 = 4
So 20840-12-4 is a valid CAS Registry Number.