The CAS Registry Mumber 5443-26-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,4,4 and 3 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 5443-26: (6*5)+(5*4)+(4*4)+(3*3)+(2*2)+(1*6)=85 85 % 10 = 5 So 5443-26-5 is a valid CAS Registry Number.
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