The CAS Registry Mumber 159104-70-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,9,1,0 and 4 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 159104-70: (8*1)+(7*5)+(6*9)+(5*1)+(4*0)+(3*4)+(2*7)+(1*0)=128 128 % 10 = 8 So 159104-70-8 is a valid CAS Registry Number.
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