The CAS Registry Mumber 845739-58-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,4,5,7,3 and 9 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 845739-58: (8*8)+(7*4)+(6*5)+(5*7)+(4*3)+(3*9)+(2*5)+(1*8)=214 214 % 10 = 4 So 845739-58-4 is a valid CAS Registry Number.
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