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.
Chemical structure of the salt {{chem|Ca[Al(OH)(H|2|O)Az|2|]•2H|2|O}} where Az<sup>2−</sup> is the dianion of [[alizarin]]. Diagram copied from [https://books.google.com.au/books?id=P8B3KEpkqxIC&pg=PA669#v=onepage&q&f=false Figure 14, p. 669]....
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