The CAS Registry Mumber 5223-04-1 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 3 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 5223-04: (6*5)+(5*2)+(4*2)+(3*3)+(2*0)+(1*4)=61 61 % 10 = 1 So 5223-04-1 is a valid CAS Registry Number.
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