2991-05-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 2991-05-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,9,9 and 1 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 2991-05:
(6*2)+(5*9)+(4*9)+(3*1)+(2*0)+(1*5)=101
101 % 10 = 1
So 2991-05-1 is a valid CAS Registry Number.