Kooky Isomerism

Wait, those things are molecules? I hesitated for a second to decide whether it's a real molecules or just a flattened box.

I encountered this question with those two kooky molecules, so kooky that I had to build models to understand them.

They are constitutional isomers, which means they have a common formula, C12H16, but have different connectivity.

Molecule 1 (left):

Molecule 2 (right):

Notice the twisted rings and two double bonds, one vertical and one horizontal. The different orientation of the double bonds is the reason why there're two peaks in the proton NMR instead of one.