20309-01-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20309-01-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,3,0 and 9 respectively; the second part has 2 digits, 0 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 20309-01:
(7*2)+(6*0)+(5*3)+(4*0)+(3*9)+(2*0)+(1*1)=57
57 % 10 = 7
So 20309-01-7 is a valid CAS Registry Number.