The four (not three, I checked archives) canopic jars contain exceptional dessicated body parts; lungs, spleens, strings of intestinal tracts, withered husks of hearts and gray, powdered brain matter.
From a previous conversation:
The question then is funding the research. You have a good link to Marcia, herbalist attached to the Silvanus Temple in Ironguard who supplied the anti-venom potion. So she might give preferential prices (negotiated by Deucalion?). Or you can try to get Lord Krothos or Vicar Othar to invest some capital cash in exchange for a share of any potions. Or via Gerdal (and her aide Sister Flora( try to research compounds yourselves to cut costs balanced against a longer time frame and more difficult skill checks.