The CAS Registry Mumber 143541-65-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,3,5,4 and 1 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 143541-65: (8*1)+(7*4)+(6*3)+(5*5)+(4*4)+(3*1)+(2*6)+(1*5)=115 115 % 10 = 5 So 143541-65-5 is a valid CAS Registry Number.
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