File:Quaternary-ammonium-cation.png
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current | 01:04, 25 January 2007 | 1,100 × 996 (18 KB) | Pngbot (talk | contribs) | optimized with optipng | |
11:09, 6 May 2006 | 1,100 × 996 (19 KB) | Benjah-bmm27 (talk | contribs) | {{PD-self}} Category:Chemical structures |
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