Azadipyrromethene
Encyclopedia
Azadipyrromethane is a dye
Dye
A dye is a colored substance that has an affinity to the substrate to which it is being applied. The dye is generally applied in an aqueous solution, and requires a mordant to improve the fastness of the dye on the fiber....

 and the name of a new class of experimental photosensitizers for photodynamic therapy
Photodynamic therapy
Photodynamic therapy is used clinically to treat a wide range of medical conditions, including malignant cancers, and is recognised as a treatment strategy which is both minimally invasive and minimally toxic...

.
Some derivatives can usefully absorb in the near-infrared.
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