The CAS Registry Mumber 68439-80-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,4,3 and 9 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 68439-80: (7*6)+(6*8)+(5*4)+(4*3)+(3*9)+(2*8)+(1*0)=165 165 % 10 = 5 So 68439-80-5 is a valid CAS Registry Number.
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