1581-61-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1581-61-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,5,8 and 1 respectively; the second part has 2 digits, 6 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 1581-61:
(6*1)+(5*5)+(4*8)+(3*1)+(2*6)+(1*1)=79
79 % 10 = 9
So 1581-61-9 is a valid CAS Registry Number.