| Component | CAS | Molecular Wt | Chemical Formula | Concentration |
| Citalopram Hydrobromide | 59729-32-7 | 405.30 | C20H21FN2O · HBr | 15 µg/mL (each analyte) |
| Citalopram Related Compound A | 64372-56-1 | 342.41 | C20H23FN2O2 | 15 µg/mL (each analyte) |
| Citalopram Related Compound C | NOT AVAILABLE | 428.41 | C20H19FN2O2 · C2H2O4 | 15 µg/mL (each analyte) |
| Citalopram Related Compound D | 1188264-72-3 | 391.28 | C19H19FN2O · HBr | 15 µg/mL (each analyte) |
| Citalopram Related Compound E | 62498-71-9 | 376.85 | C20H21FN2O2 · HCl | 15 µg/mL (each analyte) |
| Citalopram Related Compound F | 55011-89-7 | 287.83 | C18H21N · HCl | 15 µg/mL (each analyte) |
| Citalopram Related Compound G | 1332724-08-9 | 414.74 | C19H21ClFNO · HBr | 15 µg/mL (each analyte) |
| Citalopram Related Compound H | 479065-02-6 | 459.19 | C19H21BrFNO · HBr | 15 µg/mL (each analyte) |