Black Plague - Chemicals for Antidote

[Fleet]

Did you check behind the books on one of the desks?

I've pulled out every item I can find. I read about 6 other threads on this topic, but none helped. A youtube link seemed promising, but was dead. I've searched all the rooms I could find (3 large, 2 storage and the one with the mixer). I've been very thorough, checking behind everything, moving everything, checking on-top of everything.

I've spent several sessions of at least 10 minutes searching the examination rooms high and low. I would be surprised if I just "missed" it. I have the substance container in the mixer already.