The CAS Registry Mumber 439121-04-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,3,9,1,2 and 1 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 439121-04: (8*4)+(7*3)+(6*9)+(5*1)+(4*2)+(3*1)+(2*0)+(1*4)=127 127 % 10 = 7 So 439121-04-7 is a valid CAS Registry Number.
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