The CAS Registry Mumber 123493-53-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,3,4,9 and 3 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 123493-53: (8*1)+(7*2)+(6*3)+(5*4)+(4*9)+(3*3)+(2*5)+(1*3)=118 118 % 10 = 8 So 123493-53-8 is a valid CAS Registry Number.
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