The CAS Registry Mumber 1443331-27-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,4,4,3,3,3 and 1 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 1443331-27: (9*1)+(8*4)+(7*4)+(6*3)+(5*3)+(4*3)+(3*1)+(2*2)+(1*7)=128 128 % 10 = 8 So 1443331-27-8 is a valid CAS Registry Number.
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