1690-20-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1690-20-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,6,9 and 0 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1690-20:
(6*1)+(5*6)+(4*9)+(3*0)+(2*2)+(1*0)=76
76 % 10 = 6
So 1690-20-6 is a valid CAS Registry Number.