The CAS Registry Mumber 159299-69-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,9,2,9 and 9 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 159299-69: (8*1)+(7*5)+(6*9)+(5*2)+(4*9)+(3*9)+(2*6)+(1*9)=191 191 % 10 = 1 So 159299-69-1 is a valid CAS Registry Number.
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