Figure 1: Structure of MSN-(CPT)-Gal/Man, MSN-(CPT+1ɤPS)-Gal/ Man, MSN-(1ɤPS)-Man and MSN-(2ɤPS)-Man nanoparticles. A. Structure of fluorescein (FITC) B. Structure of camptothecin (CPT) C. Structure of porphyrin derivative one photon photosensitizer (1ɤPS) D. Structure of fluorene derivative two photon photosensitizer (2ɤPS).