The CAS Registry Mumber 39458-13-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,9,4,5 and 8 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 39458-13: (7*3)+(6*9)+(5*4)+(4*5)+(3*8)+(2*1)+(1*3)=144 144 % 10 = 4 So 39458-13-4 is a valid CAS Registry Number.
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