File:Acetylenedicarboxylic acid.svgDescriptionAcetylenedicarboxylic acid.svg English: acetylenedicarboxylic acid; 2-butynedioic acid; acetylenedicarboxylate Date 11 November 2009 Source
File:But-2-ynedioic acid 200.svgDescriptionBut-2-ynedioic acid 200.svg English: Structure of but-2-ynedioic acid Deutsch: Struktur von Butindisäure Date 29 March 2014 Source Own work
File:Propiolic acid synthesis 01.svgDescriptionPropiolic acid synthesis 01.svg English: Synthesis of propiolic acid Deutsch: Synthese von Propiolsäure (Acetylencarbonsäure) Date 18 September