The CAS Registry Mumber 533937-44-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,3,3,9,3 and 7 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 533937-44: (8*5)+(7*3)+(6*3)+(5*9)+(4*3)+(3*7)+(2*4)+(1*4)=169 169 % 10 = 9 So 533937-44-9 is a valid CAS Registry Number.
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