The CAS Registry Mumber 2421-14-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,4,2 and 1 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 2421-14: (6*2)+(5*4)+(4*2)+(3*1)+(2*1)+(1*4)=49 49 % 10 = 9 So 2421-14-9 is a valid CAS Registry Number.
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