The CAS Registry Mumber 172-68-9 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 1,7 and 2 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 172-68: (5*1)+(4*7)+(3*2)+(2*6)+(1*8)=59 59 % 10 = 9 So 172-68-9 is a valid CAS Registry Number.
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