The CAS Registry Mumber 5172-52-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,1,7 and 2 respectively; the second part has 2 digits, 5 and 2 respectively. Calculate Digit Verification of CAS Registry Number 5172-52: (6*5)+(5*1)+(4*7)+(3*2)+(2*5)+(1*2)=81 81 % 10 = 1 So 5172-52-1 is a valid CAS Registry Number.
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