The CAS Registry Mumber 2064117-97-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 2,0,6,4,1,1 and 7 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 2064117-97: (9*2)+(8*0)+(7*6)+(6*4)+(5*1)+(4*1)+(3*7)+(2*9)+(1*7)=139 139 % 10 = 9 So 2064117-97-9 is a valid CAS Registry Number.
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