1649-97-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1649-97-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,6,4 and 9 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 1649-97:
(6*1)+(5*6)+(4*4)+(3*9)+(2*9)+(1*7)=104
104 % 10 = 4
So 1649-97-4 is a valid CAS Registry Number.