The CAS Registry Mumber 1443342-81-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,4,4,3,3,4 and 2 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1443342-81: (9*1)+(8*4)+(7*4)+(6*3)+(5*3)+(4*4)+(3*2)+(2*8)+(1*1)=141 141 % 10 = 1 So 1443342-81-1 is a valid CAS Registry Number.
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