1-Butanesulfonic acid, 1,1,2,2,3,3,4,4,4-nonafluoro-, 9H-carbazol-3-yl
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The CAS Registry Mumber 835879-66-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,3,5,8,7 and 9 respectively; the second part has 2 digits, 6 and 6 respectively. Calculate Digit Verification of CAS Registry Number 835879-66: (8*8)+(7*3)+(6*5)+(5*8)+(4*7)+(3*9)+(2*6)+(1*6)=228 228 % 10 = 8 So 835879-66-8 is a valid CAS Registry Number.