1020109-17-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1020109-17-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,2,0,1,0 and 9 respectively; the second part has 2 digits, 1 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 1020109-17:
(9*1)+(8*0)+(7*2)+(6*0)+(5*1)+(4*0)+(3*9)+(2*1)+(1*7)=64
64 % 10 = 4
So 1020109-17-4 is a valid CAS Registry Number.