Substance 65 in chemical lab missing element

[bgr]

There is no way to kill a single monster in the whole game (except at the... ummm... well, no spoiler here, you'll see, when you get there
Your solution:

Spoiler below!

Run to the "great glass thingy with manipulators" room. Close the door, block it with the locker besides it. Now you have time to search for the container. You'll find it in no time...