I'm trying to create a topology for DNA with periodically connected ends.
There's a previous message on this, with advice by Justin:

I have a single-stranded DNA structure in a pdb file with a phosphate on
one end (P, OP1, OP2) and an oxygen on the other (O3'). These are exactly
the atoms I want to connect later on. I use pdb2gmx to get the hydrogens +
topology and give it -ter "none", which gives me the error message

"Fatal error:
There is a dangling bond at at least one of the terminal ends. Fix your
coordinate file, add a new terminal database entry (.tdb), or select the
proper existing terminal entry."

I added the flag -missing (according to Justin's advice), but does not
help. I guess I'm not understanding what bond is dangling here, and what to
add to the tdb file that would help?

Of course, I could get most of the topology I need by avoiding selecting
-ter 'none' but then I have to fiddle with adding back atoms.

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