The CAS Registry Mumber 116996-41-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,6,9,9 and 6 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 116996-41: (8*1)+(7*1)+(6*6)+(5*9)+(4*9)+(3*6)+(2*4)+(1*1)=159 159 % 10 = 9 So 116996-41-9 is a valid CAS Registry Number.
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