The CAS Registry Mumber 171049-45-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,1,0,4 and 9 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 171049-45: (8*1)+(7*7)+(6*1)+(5*0)+(4*4)+(3*9)+(2*4)+(1*5)=119 119 % 10 = 9 So 171049-45-9 is a valid CAS Registry Number.
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