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Left: Photoacoustic spectra of (red) ZnPc(tomamine)1, (blue) ZnPc(tomamine)2, (orange) ZnPc(tomamine)3, and (purple) ZnPc(tomamine)4 in an agarose gel at ca. 50 μM, compared to a standard 50 μM indocyanine green (ICG). Right: photoacoustic tomogram of the ICG control (green) and the ZnPc(tomamine)2 (purple) in an agarose phantom. See ESI for the photoacustic data for the other tomamine compounds.
