The CAS Registry Mumber 244171-04-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,4,4,1,7 and 1 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 244171-04: (8*2)+(7*4)+(6*4)+(5*1)+(4*7)+(3*1)+(2*0)+(1*4)=108 108 % 10 = 8 So 244171-04-8 is a valid CAS Registry Number.
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