Hi, @Yuvraj.
I’m sorry for my delayed response. And I’m not a toxicological chemist.
Nitroso Nebivolol looks more similar to N-Nitrosobis(2-hydroxypropyl)amine or 3-[(2-Hydroxypropyl)nitrosoamino]-1,2-propanediol. I couldn’t find the other surrogates from LCDB.
So you can select the appropriate one from 18ng/day, 26.5ng/day, 53.5ng/day, 440ng/day, 891(or GOLD: 881)ng/day, and others.
And @sumitkumarjain may help you to share his experience to decide the AI value with the literature.
I hope it will help you.