The CAS Registry Mumber 4417-68-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,4,1 and 7 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 4417-68: (6*4)+(5*4)+(4*1)+(3*7)+(2*6)+(1*8)=89 89 % 10 = 9 So 4417-68-9 is a valid CAS Registry Number.
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