The CAS Registry Mumber 1111597-97-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,1,1,5,9 and 7 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 1111597-97: (9*1)+(8*1)+(7*1)+(6*1)+(5*5)+(4*9)+(3*7)+(2*9)+(1*7)=137 137 % 10 = 7 So 1111597-97-7 is a valid CAS Registry Number.
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