1689-90-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1689-90-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,6,8 and 9 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1689-90:
(6*1)+(5*6)+(4*8)+(3*9)+(2*9)+(1*0)=113
113 % 10 = 3
So 1689-90-3 is a valid CAS Registry Number.