The CAS Registry Mumber 198955-18-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,8,9,5 and 5 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 198955-18: (8*1)+(7*9)+(6*8)+(5*9)+(4*5)+(3*5)+(2*1)+(1*8)=209 209 % 10 = 9 So 198955-18-9 is a valid CAS Registry Number.
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