I'm stuck in chapter 2. What is the code of the safe in medical room?

Have you found the paper with the code clues on it? It is shown now in our guide for room 2. The paper has 4 diagrams with button settings. The top left one is correctly aligned, the red square in the top center. Use this to set 3 buttons.

The other 3 diagrams are rotated. You need to look at them with the red square in the top center and set the remaining buttons accordingly. If you do this then you should get all the buttons.