SMILES: C(#CC(=O)[O-])C(=O)[O-]
Description: The molecule is a dicarboxylic acid dianion obtained by the deprotonation of both the carboxy groups of acetylenedicarboxylic acid. It is a C4-dicarboxylate and a dicarboxylic acid dianion. It is a conjugate base of an acetylenedicarboxylate(1-).