The CAS Registry Mumber 486421-59-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,8,6,4,2 and 1 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 486421-59: (8*4)+(7*8)+(6*6)+(5*4)+(4*2)+(3*1)+(2*5)+(1*9)=174 174 % 10 = 4 So 486421-59-4 is a valid CAS Registry Number.
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