The CAS Registry Mumber 167-71-5 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 1,6 and 7 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 167-71: (5*1)+(4*6)+(3*7)+(2*7)+(1*1)=65 65 % 10 = 5 So 167-71-5 is a valid CAS Registry Number.
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