Wikipedia:  

Acetylenedicarboxylic acid

2-BUTYNEDIOIC ACID; Butynedioic acid; 2-Butynedioic acid; butynedioic acid; Acetylenedicarboxylic acid; but-2-ynedioic acid; acetylenedicarboxylate; 2-butynedioic acid; Acetylenedicarboxylic acid (8CI); acetylenedicarboxylic acid; Acetylenedicarboxylate
Molecular Formula
C4 H2 O4
Natural Isotopic Abundance Mass
114.05628
Mono-Isotopic Molecular Masses
C12N14:   113.9953085526
C13N14:   118.0087279038
C12N15:   113.9953085526
C13N15:   118.0087279038
Acetylenedicarboxylic acid image
Acetylenedicarboxylic acid
InCHi String:
InChI=1S/C4H2O4/c5-3(6)1-2-4(7)8/h(H,5,6)(H,7,8)

canonical and isomeric SMILES:
C(#CC(=O)O)C(=O)O


PUBCHEM iupac NAME: PUBCHEM iupac TRADITIONAL NAME: PUBCHEM iupac OPENEYE NAME: PUBCHEM iupac CAS NAME: PUBCHEM iupac SYSTEMATIC NAME
but-2-ynedioic acid



PubChem Substance (SID):   85165208   10507905   6008608
PubChem Compound (CID):   371
KEGG: Compound ID   C03248
CAS Registry IDs:   928-04-1   142-45-0
PDB Chemical Component   n/a
Miscellaneous Databases and IDs:   Sigma-Aldrich A15207_ALDRICH   ChEBI CHEBI:30781   BioCyc CPD-1831   ChemIDplus 000142450   ChemSpider 13872839   EINECS 205-536-0   NMRShiftDB 10009099   DTP/NCI 631597   ChemDB 6679765   NIST Chemistry WebBook 1891196854

Reference data were obtained primarily from the PubChem database.

Three dimensional molecular rendering uses Jmol.