The CAS Registry Mumber 457621-54-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,5,7,6,2 and 1 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 457621-54: (8*4)+(7*5)+(6*7)+(5*6)+(4*2)+(3*1)+(2*5)+(1*4)=164 164 % 10 = 4 So 457621-54-4 is a valid CAS Registry Number.
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