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