1421-56-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1421-56-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,4,2 and 1 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1421-56:
(6*1)+(5*4)+(4*2)+(3*1)+(2*5)+(1*6)=53
53 % 10 = 3
So 1421-56-3 is a valid CAS Registry Number.