The CAS Registry Mumber 159849-59-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,9,8,4 and 9 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 159849-59: (8*1)+(7*5)+(6*9)+(5*8)+(4*4)+(3*9)+(2*5)+(1*9)=199 199 % 10 = 9 So 159849-59-9 is a valid CAS Registry Number.
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