The CAS Registry Mumber 12539-23-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,5,3 and 9 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 12539-23: (7*1)+(6*2)+(5*5)+(4*3)+(3*9)+(2*2)+(1*3)=90 90 % 10 = 0 So 12539-23-0 is a valid CAS Registry Number.
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