The CAS Registry Mumber 81197-65-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,1,9 and 7 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 81197-65: (7*8)+(6*1)+(5*1)+(4*9)+(3*7)+(2*6)+(1*5)=141 141 % 10 = 1 So 81197-65-1 is a valid CAS Registry Number.
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