The CAS Registry Mumber 128597-19-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,5,9 and 7 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 128597-19: (8*1)+(7*2)+(6*8)+(5*5)+(4*9)+(3*7)+(2*1)+(1*9)=163 163 % 10 = 3 So 128597-19-3 is a valid CAS Registry Number.
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