The CAS Registry Mumber 55304-74-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,3,0 and 4 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 55304-74: (7*5)+(6*5)+(5*3)+(4*0)+(3*4)+(2*7)+(1*4)=110 110 % 10 = 0 So 55304-74-0 is a valid CAS Registry Number.
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