| annotate_compounds | Annotate CAS numbers with chemical information |
| batch_process_gcms | Batch process GC-MS TXT files in a directory with sample name mapping |
| build_cas_abundance | Build a CAS × Sample abundance matrix from extracted peak areas |
| extract_peak_areas | Extract CAS and total peak areas from GC-MS results |
| filter_by_frequency | Filter compounds by occurrence frequency across samples and treatment groups |
| process_gcms_txt | Parse a single GC-MS exported TXT file |
| save_gcms_results | Save GC-MS parsing results to CSV or Excel files |
| save_postvocs_results | Save postvocs results to CSV or Excel files |