The CAS Registry Mumber 112661-76-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,6,6 and 1 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 112661-76: (8*1)+(7*1)+(6*2)+(5*6)+(4*6)+(3*1)+(2*7)+(1*6)=104 104 % 10 = 4 So 112661-76-4 is a valid CAS Registry Number.
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