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Part of the w:asymmetric synthesis of w:huperzine-Q demonstrating an intramolecular w:Pauson–Khand reaction.

The diagram was created by EdChem on 28 December 2018 using two images:

1. An image on page 212 of the following book: Ho, Tse-Lok (2016) "Dicobalt Octacarbonyl" in Fiesers' Reagents for Organic Synthesis, 28, John Wiley & Sons ISBN: 9781118942819.
2. An image from the webpage associated with the following journal article: (2011). "Asymmetric Total Synthesis of a Pentacyclic Lycopodium Alkaloid: Huperzine‐Q". w:Angew. Chem. Int. Ed. 50 (35): 8025-8028. DOI:10.1002/anie.201103550.

These images were manipulated and combined using Microsoft Paint. Both sources are protected by copyright but this specific content is not copyrightable as it consists of chemical structures and formulae and is thus in the public domain, as is this complete image.

This image of a simple structural formula is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.