The CAS Registry Mumber 116888-97-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,6,8,8 and 8 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 116888-97: (8*1)+(7*1)+(6*6)+(5*8)+(4*8)+(3*8)+(2*9)+(1*7)=172 172 % 10 = 2 So 116888-97-2 is a valid CAS Registry Number.
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