How do you pronounce "Thebaine"?

This dictionary.com entry has three alternate pronunciations.

Furthermore, no dictionary has standard linguistic pronunciations: they all seem to invent their own which is annoying beyond words to try to delve into. So could someone give me the standard linguistic pronunciation (or barring that, an ell-uh-men-tairy skool bay-sick pronunciation?)

Thanks!

I teach a class on morphine synthesis, and always pronounce it with a long e sound, like thee-bane (sorry, don’t know linguistic notation). I don’t know for sure if this is correct, but I am a chemist so it is possible that I have heard colleagues pronounce it this way and it has stuck in my head.

Thanks, I’ve never heard it pronounced. I’ve blundered the names of other chemicals I otherwise knew a little about so I will try that if I ever need to pronounce it out loud.