抄録
Six novel phloroglucinol dialdehyde diterpene derivatives (macrocarpals B-G), which have antibacterial activity, were isolated from leaves of Eucalyptus macrocarpa. These compounds have closely related structures, the molecular formula for B-F being C_<28>H_<40>O_6,and that of G being C_<28>H_<38>O_5. The structures of macrocarpals B, D, and G were analyzed by means of NMR analyses.