Hematoporphyrins

**Definition:** Iron-free derivatives of heme with 4 methyl groups, 2 hydroxyethyl groups and 2 propionic acid groups attached to the pyrrole rings. Some of these PHOTOSENSITIZING AGENTS are used in the PHOTOTHERAPY of malignant NEOPLASMS.

**Tree numbers:** - D03.383.129.578.840.500.462 - D03.633.400.909.500.462 - D04.345.783.500.462 - D23.767.727.462