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. 2022 May 26;9(6):473–481. doi: 10.1021/acs.estlett.2c00206

Figure 1.

Figure 1

(a) 1-UPFOS (CID 162420437) and (b) 2-UPFOS (CID 162420438) are (tail) positional isomers which differ by the position of the same functional group (i.e., unsaturated bond), whereas UPFOS and (c) PFEtCHxS (CID 101650) are constitutional isomers with distinct functional groups.