There are several others, such as ammonium oxalate.

References External links Oxalic acid MS Spectrum NIOSH Guide to Chemical Hazards (CDC) Table Oxalic acid content of selected vegetables (USDA) Alternative link Table Oxalic Acid Content of Selected Vegetables (USDA) About rhubarb poisoning (The Rhubarb Compendium) Oxalosis Hyperoxaluria Foundation (OHF) The Oxalate Content of Food 2008 (PDF) Oxalosis Hyperoxaluria Foundation (OHF) Diet Information Calculator Water and solute activities in aqueous oxalic acid