55821-45-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 55821-45-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,8,2 and 1 respectively; the second part has 2 digits, 4 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 55821-45:
(7*5)+(6*5)+(5*8)+(4*2)+(3*1)+(2*4)+(1*5)=129
129 % 10 = 9
So 55821-45-9 is a valid CAS Registry Number.