21123-54-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21123-54-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,2 and 3 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21123-54:
(7*2)+(6*1)+(5*1)+(4*2)+(3*3)+(2*5)+(1*4)=56
56 % 10 = 6
So 21123-54-6 is a valid CAS Registry Number.