6689-18-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 6689-18-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,6,8 and 9 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 6689-18:
(6*6)+(5*6)+(4*8)+(3*9)+(2*1)+(1*8)=135
135 % 10 = 5
So 6689-18-5 is a valid CAS Registry Number.