cyclobutadiene

Molecular Formula: C4H4


InChI: InChI=1/C4H4/c1-2-4-3-1/h1-4H

InChIKey: InChIKey=HWEQKSVYKBUIIK-UHFFFAOYAI
SMILES: C1=CC=C1

CAS number 1120-53-2

Names:
    cyclobutadiene
    cyclobuta-1,3-diene

Registries:
    PubChem CID 136879
    Beilstein =1846716
    CAS 1120-53-2 (from NIST)
    ChEBI 33657
    Gmelin 322920
    PubChem ID 10244792