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UV-Vis absorption spectra of the conjugates RGD-SiPc 4 (A), RGD-Linker-SiPc 5 (B), RGD-(Linker)2-SiPc 6 (C) and RGD-(Linker)2-Glu-SiPc 7 (D) in different solvents (i.e., DMSO, 10% Triton X-100 aqueous solution, 1% CEL aqueous solution and PBS solution). The concentration of the compounds for absorption determination was 10 μM.
