Use acetone? Make sure it's really anhydrous though.
Acetone occurs in the human body and is therefore natural.
More usefully, there's good reason to believe that steam distillation of the root will effectively separate the safrole from the (water soluble) alkaloids. Not sure how heat sensitive the alkaloids are but the steam should keep most of the oxygen out.
“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