Synonyms: 5,10,15,20-Tetra(4-hydroxyphenyl)-21H,23H-porphine;5,10,15,20-Tetra(4-hydroxyphenyl)porphyrin;5,10,15,20-Tetra(p-hydroxyphenyl)porphine;5,10,15,20-Tetra(p-hydroxyphenyl)porphyrin;5,10,15,20-Tetrakis(4-hydroxyphenyl)-21H,23H-porphine;5,10,15,20-Tetrakis(4-hydroxyphenyl)-21H,23H-porphyrin;5,10,15,20-Tetrakis(4-hydroxyphenyl)porphine;5,10,15,20-Tetrakis(4-hydroxyphenyl)porphyrin;5,10,15,20-Tetrakis(4'-hydroxyphenyl)porphine;5,10,15,20-Tetrakis(p-hydroxyphenyl)porphine;5,10,15,20-Tetrakis(p-hydroxyphenyl)porphyrin;HK 7;HK 7 (porphinederivative);Mesotetrakis(4-hydroxyphenyl)porphyrin;Tetra(p-hydroxyphenyl)porphyrin;Tetrakis(4-hydroxyphenyl)porphyrin;Tetrakis(p-hydroxyphenyl)porphyrin;meso-5,10,15,20-Tetra-(4-hydroxyphenyl)porphyrin;meso-Tetra(4-hydroxyphenyl)porphine;meso-Tetra(4-hydroxyphenyl)porphyrin;meso-Tetra(p-hydroxyphenyl)porphyrin;meso-Tetrakis(4-hydroxyphenyl)porphine;meso-Tetrakis(4-hydroxyphenyl)porphyrin;meso-Tetrakis(p-hydroxyphenyl)porphyrin;a,b,g,d-Tetrakis(4-hydroxyphenyl)porphine;