Meeting report of the 4th European biotransformation workshop

1. Challenges, strategies and new technologies in the field of biotransformation were presented and discussed at the fourth European Biotransformation Workshop which was held in collaboration with the joint ISSX/DMDG meeting on June 15, 2023 at the University of Hertfordshire in Hatfield, UK. 2. In this meeting report we summarise the presentations and discussions from this workshop. 3. The topics covered are listed below: Unusual biotransformation reactions Biotransformation Workflows in Discovery utilising various softwares for structure elucidation Biotransformation software for the identification of peptide metabolites Accelerator Mass Spectrometry (AMS) for endogenous and xenobiotic metabolite profiling Metabolite profiling using quantitative Nuclear magnetic resonance (NMR) and liquid chromatography coupled to inductively coupled plasma-mass spectrometry (LC-ICP-MS)