Singlet Oxygen, Photodynamic Therapy, and Mechanisms of Cancer Cell Death

Figure 4

Examples of first-, second-, and third-generation photosensitizers with structure. (a) Porphyrin, (b) hematoporphyrin, (c) 5′-aminolevulinic acid, (d) chlorin, (e) verteporfin, (f) anthracene-9,10-endoperoxide derivative, and (g) 2-pydidone conjugated BODIPY.