The CAS Registry Mumber 5113-45-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,1,1 and 3 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 5113-45: (6*5)+(5*1)+(4*1)+(3*3)+(2*4)+(1*5)=61 61 % 10 = 1 So 5113-45-1 is a valid CAS Registry Number.
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