Several readers hit the sciencebase.com site searching for gluconic acid. This sugar-like compound occurs naturally in fruit, honey and wine and is used industrially as an acidity regulator in food and drink (E574). It is also used in cleaning products to remove mineral deposits (it is a strong chelating agent for calcium, iron, aluminium, and copper).
Anyway, if you’re after more information and chemical structures of small molecules, you can find more than five million of them using the PubChem search box on ChemSpy.com