Four macrocarpals (macrocarpals A, B, E, and am-1) were isolated from
the leaves of Eucalyptus amplifolia. Macrocarpal-am-1 is a new macroca
rpal in which the isopentyl phloroglucinol chromophore Is coupled with
the 1,10-secoaromadendrane skeleton. Its structure is elucidated by s
pectral techniques.