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. Author manuscript; available in PMC: 2021 May 27.
Published in final edited form as: Nature. 2009 Apr 8;459(7244):270–273. doi: 10.1038/nature07937

Figure 1.

Figure 1.

Generalized chemical structure of dual-function acridone derivatives. The rigid tricyclic aromatic acridone core promotes π-π stacking for heme binding. The side chain attachment at the central nitrogen atom provides a hydrogen bond acceptor needed for the chemosensitization function, and together with the side chain at the 6-position facilitate accumulation in the digestive vacuole (DV) via acid trapping.