The CAS Registry Mumber 444809-69-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,4,8,0 and 9 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 444809-69: (8*4)+(7*4)+(6*4)+(5*8)+(4*0)+(3*9)+(2*6)+(1*9)=172 172 % 10 = 2 So 444809-69-2 is a valid CAS Registry Number.
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