131991-09-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 131991-09-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,9,9 and 1 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 131991-09:
(8*1)+(7*3)+(6*1)+(5*9)+(4*9)+(3*1)+(2*0)+(1*9)=128
128 % 10 = 8
So 131991-09-8 is a valid CAS Registry Number.