The CAS Registry Mumber 137589-71-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,5,8 and 9 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 137589-71: (8*1)+(7*3)+(6*7)+(5*5)+(4*8)+(3*9)+(2*7)+(1*1)=170 170 % 10 = 0 So 137589-71-0 is a valid CAS Registry Number.
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