1581-27-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1581-27-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,5,8 and 1 respectively; the second part has 2 digits, 2 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 1581-27:
(6*1)+(5*5)+(4*8)+(3*1)+(2*2)+(1*7)=77
77 % 10 = 7
So 1581-27-7 is a valid CAS Registry Number.