Hi Francisco,
Try this, no commas or quotation marks:

open 1iee 2blx 2bly from redo

The format mmcif is the default for this database, so I don't think you need to specify it.

<https://rbvi.ucsf.edu/chimerax/docs/user/commands/open.html#fetch>

I hope this helps,
Elaine
-----
Elaine C. Meng, Ph.D.                       
UCSF Chimera(X) team
Resource for Biocomputing, Visualization, and Informatics
Department of Pharmaceutical Chemistry
University of California, San Francisco


> On Jun 5, 2024, at 12:44 PM, Francisco Murphy Pérez via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:
>
> Dear all
> I thought this was going to work, `open "1iee, 2blx, 2bly" fromDatabase redo format mmcif`... but it does not.
>
> I have many more ids that I want to open...
>
> Can I fetch them all with a single command?
>
> Thanks