The CAS Registry Mumber 29439-99-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,9,4,3 and 9 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 29439-99: (7*2)+(6*9)+(5*4)+(4*3)+(3*9)+(2*9)+(1*9)=154 154 % 10 = 4 So 29439-99-4 is a valid CAS Registry Number.
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