The CAS Registry Mumber 114556-71-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,5,5 and 6 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 114556-71: (8*1)+(7*1)+(6*4)+(5*5)+(4*5)+(3*6)+(2*7)+(1*1)=117 117 % 10 = 7 So 114556-71-7 is a valid CAS Registry Number.
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