The CAS Registry Mumber 5228-45-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,2,2 and 8 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 5228-45: (6*5)+(5*2)+(4*2)+(3*8)+(2*4)+(1*5)=85 85 % 10 = 5 So 5228-45-5 is a valid CAS Registry Number.
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