Apologies in advance, I have a background in physics, so this question might seem awfully simple.
Anyway, I am interested in the chiral spin selectivity effect in organic molecules, and have read a paper in which they synthesize helicene molecules with side groups R = n-Pr, i-Pr with
absolutely no reference only a slight hint as to what it is an abbreviation of in either the paper or supplementary information. I thus assume that it must be some very common notation, and my guess is that Pr refers to some kind of propane/propene/propanol, and n and i refers to some normal and altered structure, respectively. But I don't know.
I would be grateful if someone could shed some light on it for me.