The CAS Registry Mumber 890012-86-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,9,0,0,1 and 2 respectively; the second part has 2 digits, 8 and 6 respectively. Calculate Digit Verification of CAS Registry Number 890012-86: (8*8)+(7*9)+(6*0)+(5*0)+(4*1)+(3*2)+(2*8)+(1*6)=159 159 % 10 = 9 So 890012-86-9 is a valid CAS Registry Number.
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