Hi, I think I have a correct pdb file here, containing Sodium Chloride
----

TITLE     MOL processed by ACT - The Alexandria Chemistry Tookit

REMARK    THIS IS A SIMULATION BOX

CRYST1   28.200   28.200   28.200  90.00  90.00  90.00 P 1           1

MODEL        1

ATOM      1  Na    Na    1       0.000   0.000   0.000  1.00
0.00           Na

ATOM      2  Cl    Cl    2       2.820   0.000   0.000  1.00
0.00           Cl

ATOM      3  Na    Na    3       2.820   0.000   2.820  1.00
0.00           Na

ATOM      4  Cl    Cl    4       0.000   0.000   2.820  1.00
0.00           Cl

TER

ENDMDL

----
If I try to convert it to an sdf file using
obabel -ipdb MX_4.pdb -osdf -O mx4.sdf
I get:
----

MX_4.pdb

 OpenBabel03242309183D

  4  0  0  0  0  0  0  0  0  0999 V2000

    0.0000    0.0000    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0

    2.8200    0.0000    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0

    2.8200    0.0000    2.8200 N   0  0  0  0  0  0  0  0  0  0  0  0

    0.0000    0.0000    2.8200 C   0  0  0  0  0  0  0  0  0  0  0  0

M  END

>  <TITLE>

    MOL processed by ACT - The Alexandria Chemistry Tookit

>  <REMARK>

    THIS IS A SIMULATION BOX

>  <MODEL>

       1

$$$$

----
Sodium is converted to Nitrogen and Chloride to Carbon. I tried meddling
with the atomtyp.txt file but to no avail. Any suggestions to make this
work as it should?

Thanks,

--
David van der Spoel, Ph.D.,
Professor of Computational Molecular Biophysics
Uppsala University.
http://virtualchemistry.org









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