The CAS Registry Mumber 161611-73-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,1,6,1 and 1 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 161611-73: (8*1)+(7*6)+(6*1)+(5*6)+(4*1)+(3*1)+(2*7)+(1*3)=110 110 % 10 = 0 So 161611-73-0 is a valid CAS Registry Number.
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