The CAS Registry Mumber 128-72-3 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 1,2 and 8 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 128-72: (5*1)+(4*2)+(3*8)+(2*7)+(1*2)=53 53 % 10 = 3 So 128-72-3 is a valid CAS Registry Number.
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