Missing one ingredient to create the acid! [spoilers?]

[vt2010]

Unfortunately I don't remember which one I am missing. I put the three that I had in the containers in the laboratory and now the computer does not tell me the names anymore. If that helps I am missing the second one from the left in the machine that creates the acid.

[spoilers]
Are all four ingredients found in the wine cellar? If so let me know the location of all four ingredients. I've been stuck for a good hour.
[/spoilers]

[NGW]

They're all in the wine cellar, yes. Can't recall the exact locations for them all off the top of my head though, sorry.

[vt2010]

OK found the last one by watching frontcannon's youtube video #7 : http://www.youtube.com/watch?v=l6ZvwH3tmPk

He actually had the same problem I did. I guess the last ingredient is easy to overlook because it lies on the floor.