The CAS Registry Mumber 115559-71-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,5,5,5 and 9 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 115559-71: (8*1)+(7*1)+(6*5)+(5*5)+(4*5)+(3*9)+(2*7)+(1*1)=132 132 % 10 = 2 So 115559-71-2 is a valid CAS Registry Number.
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