The CAS Registry Mumber 105545-04-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,5,5,4 and 5 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 105545-04: (8*1)+(7*0)+(6*5)+(5*5)+(4*4)+(3*5)+(2*0)+(1*4)=98 98 % 10 = 8 So 105545-04-8 is a valid CAS Registry Number.
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