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Structures of some Chl derivatives as photosensitizers in photodynamic therapy. (A) Photochlor (2-[1-hexyloxyethyl]-2-devinyl pyropheophorbide-a, HPPH). (B) Taraporfin (Mono-L-aspartyl chlorin e6, NPe6). (C) Chlorin e6. (D) Purpurin (PP)-18. (E) Chlorin p6. (F) Purpurinimide. (G) Ketobacteriochlorin. (H) Zn-Benzochlorin. (I) Benzbaceriochlorin.
