The CAS Registry Mumber 128043-86-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,0,4 and 3 respectively; the second part has 2 digits, 8 and 6 respectively. Calculate Digit Verification of CAS Registry Number 128043-86: (8*1)+(7*2)+(6*8)+(5*0)+(4*4)+(3*3)+(2*8)+(1*6)=117 117 % 10 = 7 So 128043-86-7 is a valid CAS Registry Number.
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