The CAS Registry Mumber 185811-05-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,5,8,1 and 1 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 185811-05: (8*1)+(7*8)+(6*5)+(5*8)+(4*1)+(3*1)+(2*0)+(1*5)=146 146 % 10 = 6 So 185811-05-6 is a valid CAS Registry Number.
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