The CAS Registry Mumber 18172-23-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,8,1,7 and 2 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 18172-23: (7*1)+(6*8)+(5*1)+(4*7)+(3*2)+(2*2)+(1*3)=101 101 % 10 = 1 So 18172-23-1 is a valid CAS Registry Number.
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