The CAS Registry Mumber 71130-71-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,1,3 and 0 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 71130-71: (7*7)+(6*1)+(5*1)+(4*3)+(3*0)+(2*7)+(1*1)=87 87 % 10 = 7 So 71130-71-7 is a valid CAS Registry Number.
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