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Extracted ion chromatograms of isobaric NAPE structural isomers. Selective detection is enabled by N‐acyl chain specific selected reaction monitoring of PE 38:2‐N‐16:0 (small dashes), PE 36:2‐N‐18:0 (continuous line), and PE 36:1‐N‐18:1 (large dashes). Full scan approaches, even with high mass resolution, would only detect the sum of all structural isomers (dots).
