The CAS Registry Mumber 143188-59-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,3,1,8 and 8 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 143188-59: (8*1)+(7*4)+(6*3)+(5*1)+(4*8)+(3*8)+(2*5)+(1*9)=134 134 % 10 = 4 So 143188-59-4 is a valid CAS Registry Number.
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