The CAS Registry Mumber 439096-81-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,3,9,0,9 and 6 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 439096-81: (8*4)+(7*3)+(6*9)+(5*0)+(4*9)+(3*6)+(2*8)+(1*1)=178 178 % 10 = 8 So 439096-81-8 is a valid CAS Registry Number.
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