The CAS Registry Mumber 128856-01-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,8,5 and 6 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 128856-01: (8*1)+(7*2)+(6*8)+(5*8)+(4*5)+(3*6)+(2*0)+(1*1)=149 149 % 10 = 9 So 128856-01-9 is a valid CAS Registry Number.
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