The CAS Registry Mumber 123942-44-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,3,9,4 and 2 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 123942-44: (8*1)+(7*2)+(6*3)+(5*9)+(4*4)+(3*2)+(2*4)+(1*4)=119 119 % 10 = 9 So 123942-44-9 is a valid CAS Registry Number.
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