81709-97-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81709-97-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,7,0 and 9 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 81709-97:
(7*8)+(6*1)+(5*7)+(4*0)+(3*9)+(2*9)+(1*7)=149
149 % 10 = 9
So 81709-97-9 is a valid CAS Registry Number.