3543553 mTHPP meso-tetra(3-hydroxyphenyl)porphine 7 3543555 mTHPP meso-tetra(m-hydroxyphenyl)-21,23H-porphyrin 1 3543554 mTHPP Methylene blue and 5,10,15,20-tetrakis(3-hydroxyphenyl)porphyrin 1 3543556 mTHPP model photosensitizer 5,10,15,20-tetrakis(3-hydroxyphenyl)porphyrin 1