The CAS Registry Mumber 105819-56-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,5,8,1 and 9 respectively; the second part has 2 digits, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 105819-56: (8*1)+(7*0)+(6*5)+(5*8)+(4*1)+(3*9)+(2*5)+(1*6)=125 125 % 10 = 5 So 105819-56-5 is a valid CAS Registry Number.
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