(2S,3Z,5S)-3-(2-aminoethylidene)-7-oxo-4-oxa-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (2S,3Z,5S)-3-(2-aminoethylidene)-7-keto-4-oxa-1-azabicyclo[3.2.0]heptane-2-carboxylic acid CHEBI:15423