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.
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{{Information |Description={{de|Struktur von all-trans-Retinal}}{{en|Structure of all-trans retinal}} |Source={{de|selbst erstellt}}{{en|own work}} |Date={{subst:CURRENTYEAR}}-{{subst:CURRENTMONTH}}-{{subst:CURRENTDAY2}} |Author=~~~ |Permission=Image is i