The CAS Registry Mumber 111497-91-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,1,4,9 and 7 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 111497-91: (8*1)+(7*1)+(6*1)+(5*4)+(4*9)+(3*7)+(2*9)+(1*1)=117 117 % 10 = 7 So 111497-91-7 is a valid CAS Registry Number.
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