How to edit inventory in save game? Help!

[sparnaby]

This is my last resort, in Black Plague I went to the Examination room before any of the other rooms, scoured it top to bottom and found all six chemicals (including sulphur), and dumped them all in the machine. Then I went off and did the Kennels and Chemical room, but now that I've come back to the examination room, it acts like I didn't put the chemicals in.

I've searched every nook and cranny of every room several times just in case one of them decided to spawn again or something, but there's nothing. So I guess this is just a bug. So can someone tell me what I need to edit in my savegame in order to give myself all the chemicals again? Thank you very much.