21431-83-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21431-83-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,4,3 and 1 respectively; the second part has 2 digits, 8 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 21431-83:
(7*2)+(6*1)+(5*4)+(4*3)+(3*1)+(2*8)+(1*3)=74
74 % 10 = 4
So 21431-83-4 is a valid CAS Registry Number.