1523-91-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1523-91-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,5,2 and 3 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 1523-91:
(6*1)+(5*5)+(4*2)+(3*3)+(2*9)+(1*1)=67
67 % 10 = 7
So 1523-91-7 is a valid CAS Registry Number.