[gmx-users] How to specify conection between 2 molecule in the top file?

[Frankie Montenegro]

Hi everyone, I have a question regarding a forcefield build.
Is there a way to specify in the topology file how to bond two molecules
 one to another?

So this thing, a halfaring + carboxyl on the left is one molecule and
similar
 thing on the right is the other molecule. But I need to bond carbons a and
b
 to get the full ring. Is this possible? Please don't ask me why I didn't
make the
whole thing one molecule (it is convinient for some other reason) I am using
my
 own bonds angles and dihedrals, not "virtual sites" or any of that stuff.
Is that "+" and "-" stuff from rtp file going to work here? Thanks, Frankie
                       H                                 H
  O                     \____                  _____/                      O
     \                   /Ca                        Cb\                    /
      \                 /                                  \
/
       C1-----------C2            ???                 C2-----------C1
       /               \                                    /
\
      /                 \Ca__                  ___Cb/                   \
    O                  /                               \
O
                       H                                   H
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