'LP' generated in topology file

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I am using CGenff to generate the topology file for my ligands. For some reason, an additional LP would appear for ligands that contain Cl. May I know what it means?

Thank you.

Please read the following paper before continuing: http://dx.doi.org/10.1016/j.bmc.2016.06.034

You should understand a force field and its conventions before using it :)