Macrocarpals (MCs) are antibacterial compounds that were recently isolated from a Eucalyptus plant and consist of a phloroglucinol dicarbaldehyde part and a diterpene. 1.2) Several biological activities of phloroglucinol derivatives such as anti-germination activity against seeds, 3) photosystem II inhibition, 4) antibacterial and antiviral activities, 5) antagonism to thromboxane A2 and leukotriene D4, 6) and human immunodeficiency ...