Please find the similar request regarding N-Nitroso Melatonin.
Ref: AI for en Indole struktur (N-Nitroso melatonin) - #4 by Amanda
https://onlinelibrary.wiley.com/doi/epdf/10.1111/j.1600-079X.2008.00655.x
According to European Medicines Agency
12 October 2023; EMA/451665/2023
Page-2: Potency categorisation approach does not apply to N-nitrosamines where the N-nitroso group is attached to a nitrogen within a hetero aromatic ring (e.g., nitrosated indole).