The CAS Registry Mumber 161717-97-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,1,7,1 and 7 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 161717-97: (8*1)+(7*6)+(6*1)+(5*7)+(4*1)+(3*7)+(2*9)+(1*7)=141 141 % 10 = 1 So 161717-97-1 is a valid CAS Registry Number.
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