109691-90-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 109691-90-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,6,9 and 1 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 109691-90:
(8*1)+(7*0)+(6*9)+(5*6)+(4*9)+(3*1)+(2*9)+(1*0)=149
149 % 10 = 9
So 109691-90-9 is a valid CAS Registry Number.