The CAS Registry Mumber 34398-05-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,4,3,9 and 8 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 34398-05: (7*3)+(6*4)+(5*3)+(4*9)+(3*8)+(2*0)+(1*5)=125 125 % 10 = 5 So 34398-05-5 is a valid CAS Registry Number.
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