81689-97-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81689-97-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,6,8 and 9 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 81689-97:
(7*8)+(6*1)+(5*6)+(4*8)+(3*9)+(2*9)+(1*7)=176
176 % 10 = 6
So 81689-97-6 is a valid CAS Registry Number.