# Zn2+ issues help needed :)

**URL:** https://ask.bioexcel.eu/t/zn2-issues-help-needed/1871
**Category:** HADDOCK
**Created:** [March 28, 2020, 3:11pm UTC](https://ask.bioexcel.eu/t/zn2-issues-help-needed/1871 "2020-03-28T15:11:09Z")
**Posts on this page:** 1
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### Author: ![amjjbonvin](https://dub1.discourse-cdn.com/flex013/user_avatar/ask.bioexcel.eu/amjjbonvin/32/23_2.png) [@amjjbonvin](https://ask.bioexcel.eu/u/amjjbonvin)
#### Post date: [March 28, 2020, 3:36pm UTC](https://ask.bioexcel.eu/t/zn2-issues-help-needed/1871/2 "2020-03-28T15:36:01Z")

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> Unable to generate topology for ligand ZN+. PRODRG did not create the required output:
> 
> > Found unsupported atom type Z (atom ’ ZN ') in your coordinates.

This nomenclature does not follow the instructions since the atom name should be ZN+2 and the residue name ZN2

Be careful with the columns in your PDB file!

The ZN+2 atom name should be shifted by one column to the left (i.e. there should be a space between the atom and residue names).

> First pdb file contains multiple forms of the same residue. This is not supported in the current form. If you would like to supply multiple conformations, please create an ensemble  
> ATOM 11366 ZN ZN+2 724 -8.003 3.205 3.172 0.00 0.00

> 

And if you have multiple zinc atoms, each should have unique residue and atom numbers

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