A new dimer, aristoaristone 3, has been isolated from Aristotelia australasica. It is comprised of one moiety each of aristone and aristolasicone linked by the dihydroindole nitrogen and an aromatic carbon. A tentative hemisynthesis from the two monomers led to oxidized products which were identified as bis-aristone B and 19-oxoaristotelone 4. © 1993, Taylor & Francis Group, LLC. All rights reserved.