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(a) Structure of the NIR absorbing naphthalene fused BODIPY dimer 73 reported by Ni et al. that demonstrated high photostability and a greater PA response than the ICG cyanine dye (186). (b) Time-dependent in vivo PA images of a Hep-G2-tumor bearing mouse anatomy after intravenous injection of 73 loaded (2.5 WT%) BSA nanoparticles. Reproduced with permission from ref. 186. Copyright 2016 Royal Society of Chemistry.
