The CAS Registry Mumber 54200-44-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,2,0 and 0 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 54200-44: (7*5)+(6*4)+(5*2)+(4*0)+(3*0)+(2*4)+(1*4)=81 81 % 10 = 1 So 54200-44-1 is a valid CAS Registry Number.
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