The CAS Registry Mumber 89708-26-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,7,0 and 8 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 89708-26: (7*8)+(6*9)+(5*7)+(4*0)+(3*8)+(2*2)+(1*6)=179 179 % 10 = 9 So 89708-26-9 is a valid CAS Registry Number.
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