The CAS Registry Mumber 657401-73-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,5,7,4,0 and 1 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 657401-73: (8*6)+(7*5)+(6*7)+(5*4)+(4*0)+(3*1)+(2*7)+(1*3)=165 165 % 10 = 5 So 657401-73-5 is a valid CAS Registry Number.
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