Ammonium oxalate

Ammonium oxalate, C2H8N2O4 (sometimes written as (NH4)2C2O4), is an oxalate salt with ammonium (sometimes as a monohydrate). It is a colorless salt under standard conditions and is odorless and non-volatile. It is a constituent of some types of kidney stone. Found also in guano. ...
Found on http://en.wikipedia.org/wiki/Ammonium_oxalate
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