Parasubindoles A-G, Seven Eremophilanyl Indoles from the Whole Plant of Parasenecio albus.

Parasubindoles A-G (1-7), seven eremophilanyl indoles with an unprecedented 12 H-cyclopentane[ b]naphthalenespiro-1,3'-indole skeleton, were isolated from the whole plant of Parasenecio albus. Their structures with absolute configurations were elucidated by spectroscopic methods, single-crystal X-ray diffraction, and ECD analyses. Plausible biosynthetic pathways of 1-7 were postulated.