The CAS Registry Mumber 429-54-9 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 4,2 and 9 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 429-54: (5*4)+(4*2)+(3*9)+(2*5)+(1*4)=69 69 % 10 = 9 So 429-54-9 is a valid CAS Registry Number.
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