# Covalent CL in small molecule is not supported

**URL:** <https://ask.bioexcel.eu/t/covalent-cl-in-small-molecule-is-not-supported/6238>\
**Category:** Uncategorized\
**Created:** [August 25, 2026, 12:59pm UTC](https://ask.bioexcel.eu/t/covalent-cl-in-small-molecule-is-not-supported/6238 "2026-08-25T12:59:55Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Bahaa\_Ali](https://avatars.discourse-cdn.com/v4/letter/b/47e85d/32.png) [@Bahaa\_Ali](https://ask.bioexcel.eu/u/Bahaa_Ali)\
**Post date:** [August 25, 2026, 12:59pm UTC](https://ask.bioexcel.eu/t/covalent-cl-in-small-molecule-is-not-supported/6238/1 "2026-08-25T12:59:55Z")

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I am trying to dock my small molecule, but each time covalent CL is replaced with CH3.

is there a way to solve other than running local haddock with my generated parameters?