This is "Humanities Tower 2".
When I was a student is was "Sciences Tower", and next to it, the Faculty of Sciences (Physics, Mathematics, Actuary, Biology), but it moved to another part of CU:
As you can see, the building on the right looks like a serpent, ending in an auditorium, with an outer mural.
The mural is by José Chávez Morado, it's named "The Conquest of Energy".
All I had to do to watch it, during my first semester as a student, was to look left, since the classroom was all windows.