21H,23H-Porphine-2,18-dipropanoic acid, 3,7,12,17-tetramethyl-, dihydrochloride 3,7,12,17-Tetramethyl-21H,23H-porphine-2,18-dipropionic acid dihydrochloride 448-65-7 68929-05-5 Deuteroporphyrin IX dihydrochloride EINECS 273-037-5