The CAS Registry Mumber 55593-54-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,5,9 and 3 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 55593-54: (7*5)+(6*5)+(5*5)+(4*9)+(3*3)+(2*5)+(1*4)=149 149 % 10 = 9 So 55593-54-9 is a valid CAS Registry Number.
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