The CAS Registry Mumber 189271-05-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,9,2,7 and 1 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 189271-05: (8*1)+(7*8)+(6*9)+(5*2)+(4*7)+(3*1)+(2*0)+(1*5)=164 164 % 10 = 4 So 189271-05-4 is a valid CAS Registry Number.
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