butynedioic acid

InChI: InChI=1/C4H2O4/c5-3(6)1-2-4(7)8/h(H,5,6)(H,7,8)

InChIKey: InChIKey=YTIVTFGABIZHHX-UHFFFAOYAA
SMILES: OC(=O)C#CC(O)=O

CAS number 142-45-0

Names:
    Acetylenedicarboxylate
    Acetylenedicarboxylic acid
    butynedioic acid
    2-Butynedioic acid

Registries:
    PubChem CID 371
    Beilstein =878357
    CAS 142-45-0 (from NIST)
    ChEBI 30781
    Gmelin 26624
    Kegg C03248
    PubChem ID 6117