20817-91-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20817-91-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,8,1 and 7 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 20817-91:
(7*2)+(6*0)+(5*8)+(4*1)+(3*7)+(2*9)+(1*1)=98
98 % 10 = 8
So 20817-91-8 is a valid CAS Registry Number.