The CAS Registry Mumber 105996-99-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,5,9,9 and 6 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 105996-99: (8*1)+(7*0)+(6*5)+(5*9)+(4*9)+(3*6)+(2*9)+(1*9)=164 164 % 10 = 4 So 105996-99-4 is a valid CAS Registry Number.
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