is tautomer of 1H-pyrrole 0 1-aza-2,4-cyclopentadiene 1H-pyrrole 67.042 67.08924 A tautomer of pyrrole that has the double bonds at positions 2 and 4. Beilstein:1159 C4H5N CAS:109-97-7 CHEBI:19203 Gmelin:1705 InChI=1S/C4H5N/c1-2-4-5-3-1/h1-5H KAESVJOAVNADME-UHFFFAOYSA-N PMID:1556177 PMID:2917974 Pyrrol c1cc[nH]c1 chebi_ontology divinyleneimine divinylenimine imidole monopyrrole pyrrole pyrrole 3H-pyrrole 2H-pyrrole