The CAS Registry Mumber 143302-20-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,3,3,0 and 2 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 143302-20: (8*1)+(7*4)+(6*3)+(5*3)+(4*0)+(3*2)+(2*2)+(1*0)=79 79 % 10 = 9 So 143302-20-9 is a valid CAS Registry Number.
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