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Ammonium oxalate, C2H8N2O4 - sometimes written as (NH4)2C2O4 - is an oxalate salt with ammonium (sometimes as a monohydrate).
A 2257 (OTTO) Ammonium oxalate, GR 99% Cas 6009-70-7 - used as an analytical reagent and general reducing agent. A 2257 (OTTO) Ammonium oxalate, GR 99% Cas 6009-70-7 - used as anticoagulants, to preserve blood outside the body.