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Two-photon-enhanced oxygen probe PtP-C343 consisting of phosphorescent Pt meso-tetraarylporphyrin (PtP, red), several coumarin-343 units (C343, blue), polyarylglycine dendrimer (black) and peripheral oligoethylene-glycol residues (green). Arrows in the cartoon depict excitation of the C343 antenna via 2PA (brown), FRET (yellow) and phosphorescence of PtP-core (red).
