Two different molecules in a box of water

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1

GROMACS version:2023
GROMACS modification: Yes/No
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Hi.
I am new to using the Gromacs and would be grateful if you could help me.
I want to have 2 molecules (molecules A and B) in a box of water.
I tried to use the ligpargen server for each molecule separately but it gave me something like the below:

molecule A:

opls_802 C802 12.0110 0.000 A 3.50000E-01 2.76144E-01

molecule B:
opls_802 O802 15.9990 0.000 A 2.96000E-01 8.78640E-01

One atom type (opls_802) for two different atoms!

Probably there is one other way to have two different molecules in one system that I do not know!
I would be grateful if you could help me.

2

You need to rename the atomtypes such that their names are unique.

3

Thanks for your reply!
I manually changed the atomtypes and it worked!