Bram Strokers Dracula: What's in the bottle scene

This has been bugging at me for a good decade. Just eating away from my soul, why did Francis Ford Coppola do this scene? What is the meaning of this scene? Was it important enough that Keanu Reeves character Jonathan Harker had to find that room with the old case and open it? Please give your comments down below, honestly nobody really knows.

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