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The CAS Registry Mumber 58591-45-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,8,5,9 and 1 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 58591-45: (7*5)+(6*8)+(5*5)+(4*9)+(3*1)+(2*4)+(1*5)=160 160 % 10 = 0 So 58591-45-0 is a valid CAS Registry Number.