Hi Stefan, OSLSelection can only handle the "#0:30" part of the spec -- it doesn't handle intersections, named selectors, etc. What you need to use is chimera.specifier.evalSpec("#0:30 & without CA/C1'"), which returns an ItemizedSelection. --Eric Eric Pettersen UCSF Computer Graphics Lab

On Mar 10, 2021, at 4:57 AM, achatz <achatz@wzw.tum.de> wrote:

Hello, I want to select a sidechain without CA in Python. The working command line

select #0:30 & without CA/C1'

is recreated in Python like this:

chimera.selection.OSLSelection("#0:30 & without CA/C1'")

But the lexer complains about an "illegal symbol in identifier" which is the apostrophe after C1. How do I solve this issue? Thanks Stefan

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