The CAS Registry Mumber 99734-29-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,7,3 and 4 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 99734-29: (7*9)+(6*9)+(5*7)+(4*3)+(3*4)+(2*2)+(1*9)=189 189 % 10 = 9 So 99734-29-9 is a valid CAS Registry Number.
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