The CAS Registry Mumber 5263-43-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,2,6 and 3 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 5263-43: (6*5)+(5*2)+(4*6)+(3*3)+(2*4)+(1*3)=84 84 % 10 = 4 So 5263-43-4 is a valid CAS Registry Number.
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