The CAS Registry Mumber 118497-09-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,8,4,9 and 7 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 118497-09: (8*1)+(7*1)+(6*8)+(5*4)+(4*9)+(3*7)+(2*0)+(1*9)=149 149 % 10 = 9 So 118497-09-9 is a valid CAS Registry Number.
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