Thanks for sharing your results! Was there anything in particular that inspired your choice of solvent?
Have you read a
recent thread about the diverse range of alkaloids that rue presents? The paper on novel rue alkaloids is open access (I think?) so there'll be some food for thought for you. The closest you'll get to a real answer would probably involve some form of chemical analysis. It would be worth getting in touch with one of the relevant members (Benzyme or Endlessness) to follow that up.
Have you checked what kind of fluorescence your PEG400 extract displays?
“There is a way of manipulating matter and energy so as to produce what modern scientists call 'a field of force'. The field acts on the observer and puts him in a privileged position vis-à-vis the universe. From this position he has access to the realities which are ordinarily hidden from us by time and space, matter and energy. This is what we call the Great Work."
― Jacques Bergier, quoting Fulcanelli