1-Butanesulfonic acid, 1,1,2,2,3,3,4,4,4-nonafluoro-, [1,1'-biphenyl]-4-yl
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The CAS Registry Mumber 405201-87-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,0,5,2,0 and 1 respectively; the second part has 2 digits, 8 and 7 respectively. Calculate Digit Verification of CAS Registry Number 405201-87: (8*4)+(7*0)+(6*5)+(5*2)+(4*0)+(3*1)+(2*8)+(1*7)=98 98 % 10 = 8 So 405201-87-8 is a valid CAS Registry Number.