Table 2. Ionization potential (IP) determined in gas phase at ω97XD66/6-31g** (ref. 42 and 43) level for FAD and the different side chains considered in position 391.
| FAD | Tyr | Trp | Phe | |
| IP/eV | 8.05 | 8.15 | 7.54 | 8.84 |
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