Scheme 1.
Synthesis route for the axially substituted SiPc-PQ 2; SiPc-COOH 3; and the peptide conjugates RGD-SiPc 4, RGD-Linker-SiPc 5, RGD-(Linker)2-SiPc 6, and RGD-(Linker)2-Glu-SiPc 7.
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