Fig. 2From: Clinical development of photodynamic agents and therapeutic applicationsBasic structure of PSs. 1. Porphyrin (ex: 407Â nm, em 620Â nm); 2. Bacteriochlorin (ex: 374Â nm, em 795Â nm); 3. Chlorin (ex: 405Â nm, em 670Â nm); 4. Phthalocyanine (ex: 635Â nm, em 700Â nm)Back to article page