1812-91-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1812-91-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,8,1 and 2 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 1812-91:
(6*1)+(5*8)+(4*1)+(3*2)+(2*9)+(1*1)=75
75 % 10 = 5
So 1812-91-5 is a valid CAS Registry Number.