666817-89-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 666817-89-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,6,8,1 and 7 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 666817-89:
(8*6)+(7*6)+(6*6)+(5*8)+(4*1)+(3*7)+(2*8)+(1*9)=216
216 % 10 = 6
So 666817-89-6 is a valid CAS Registry Number.