The CAS Registry Mumber 185418-56-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,5,4,1 and 8 respectively; the second part has 2 digits, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 185418-56: (8*1)+(7*8)+(6*5)+(5*4)+(4*1)+(3*8)+(2*5)+(1*6)=158 158 % 10 = 8 So 185418-56-8 is a valid CAS Registry Number.
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