Hi again,

can anybody tell me if this toppar is correct?
I doubt it, cause VMD only shows a bond to O1 but not to O2.

I can't figure out where the mistake is hiding confused

The rest of the molecule is generated correctly.

Code:
* BA residue
*
GROUP                 !      O1  O2 (-)
ATOM C1   CL     0.62 !       \\ /
ATOM O1   OCL   -0.76 !        C1
ATOM O2   OCL   -0.76 !         |
ATOM C2   CTL2  -0.28 !         |
ATOM H2A  HAL2   0.09 !   H2A---C2---H2B
[...]

! bonding
BOND  C1  C2     C1  O1      C1  O2
[...]
DOUBLE C1 O1
ACCEPTOR 01 C1
ACCEPTOR 02 C1

! chain torsions
IC       O1   C1   C2   C3    0.0  0.0  180.0  0.0  0.0
IC       O2   C1   C2   C3    0.0  0.0    0.0  0.0  0.0
[...]


Thanks and kind regards
Bjoern