The CAS Registry Mumber 126661-34-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,6,6,6 and 1 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 126661-34: (8*1)+(7*2)+(6*6)+(5*6)+(4*6)+(3*1)+(2*3)+(1*4)=125 125 % 10 = 5 So 126661-34-5 is a valid CAS Registry Number.
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