The CAS Registry Mumber 15140-23-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,5,1,4 and 0 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 15140-23: (7*1)+(6*5)+(5*1)+(4*4)+(3*0)+(2*2)+(1*3)=65 65 % 10 = 5 So 15140-23-5 is a valid CAS Registry Number.
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