The CAS Registry Mumber 111330-30-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,1,3,3 and 0 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 111330-30: (8*1)+(7*1)+(6*1)+(5*3)+(4*3)+(3*0)+(2*3)+(1*0)=54 54 % 10 = 4 So 111330-30-4 is a valid CAS Registry Number.
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