The CAS Registry Mumber 5268-66-6 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 8 respectively; the second part has 2 digits, 6 and 6 respectively. Calculate Digit Verification of CAS Registry Number 5268-66: (6*5)+(5*2)+(4*6)+(3*8)+(2*6)+(1*6)=106 106 % 10 = 6 So 5268-66-6 is a valid CAS Registry Number.
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