The CAS Registry Mumber 142662-43-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,6,6 and 2 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 142662-43: (8*1)+(7*4)+(6*2)+(5*6)+(4*6)+(3*2)+(2*4)+(1*3)=119 119 % 10 = 9 So 142662-43-9 is a valid CAS Registry Number.
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