The CAS Registry Mumber 116330-65-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,6,3,3 and 0 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 116330-65: (8*1)+(7*1)+(6*6)+(5*3)+(4*3)+(3*0)+(2*6)+(1*5)=95 95 % 10 = 5 So 116330-65-5 is a valid CAS Registry Number.
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