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. Author manuscript; available in PMC: 2024 Mar 20.
Published in final edited form as: Angew Chem Int Ed Engl. 2023 Feb 17;62(13):e202214855. doi: 10.1002/anie.202214855

Figure 2.

Figure 2.

a) Proposed reaction mechanism between NO (via N2O3) and SCR-NO. SCR-NO and the free carboxylate shown in blue are PA-active; however, after hydrolysis to the corresponding carboxylic acid product, spontaneous spiro-lactonization yields the closed PA-inactive product shown in grey. b) Chemical structural of SCR-NO (blue), PA-inactive turnover product form of SCR-NO (grey), and IR-1061 (green). c) Cartoon schematic showing the production of two SWIR signals before reaction with NO and one SWIR signal (from the reference) after reaction with NO.