6556-28-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 6556-28-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,5,5 and 6 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 6556-28:
(6*6)+(5*5)+(4*5)+(3*6)+(2*2)+(1*8)=111
111 % 10 = 1
So 6556-28-1 is a valid CAS Registry Number.