The CAS Registry Mumber 80997-82-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,0,9,9 and 7 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 80997-82: (7*8)+(6*0)+(5*9)+(4*9)+(3*7)+(2*8)+(1*2)=176 176 % 10 = 6 So 80997-82-6 is a valid CAS Registry Number.
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