1991-63-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1991-63-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,9,9 and 1 respectively; the second part has 2 digits, 6 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 1991-63:
(6*1)+(5*9)+(4*9)+(3*1)+(2*6)+(1*3)=105
105 % 10 = 5
So 1991-63-5 is a valid CAS Registry Number.