The CAS Registry Mumber 108330-80-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,8,3,3 and 0 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 108330-80: (8*1)+(7*0)+(6*8)+(5*3)+(4*3)+(3*0)+(2*8)+(1*0)=99 99 % 10 = 9 So 108330-80-9 is a valid CAS Registry Number.
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