309-71-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 309-71-7 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 3,0 and 9 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 309-71:
(5*3)+(4*0)+(3*9)+(2*7)+(1*1)=57
57 % 10 = 7
So 309-71-7 is a valid CAS Registry Number.