PyMOL: Get sequence of selection

I have made a selection of residues like this:

fetch 1bsx
select interface_1bsx, byres((1bs and chain A) within 5A of (1bsx and chain X)) 

How do I get the sequence of interface_1bsx?

Use the iterate command (pymol wiki):

iterate interface_1bsx, resn

Or if you prefer to have it in a python list:

residues = []
iterate interface_1bsx, residues.append(resn)
print(residues)