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

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© 2022 The Authors. Published by American Chemical Society

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(a) CEtAmPr-FBSA (CID 139595456) and (b) AmPr-FBSA-PrA (CID 162420439) are (headgroup) positional isomers which differ by the position of the highlighted propanoic acid group.