# RDKit One Component Reaction

**URL:** <https://forum.knime.com/t/rdkit-one-component-reaction/1018>\
**Category:** Community Extensions\
**Tags:** rdkit\
**Created:** [February 2, 2011, 11:51am UTC](https://forum.knime.com/t/rdkit-one-component-reaction/1018 "2011-02-02T11:51:04Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jada](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/j/bbe5ce/32.png) [@jada](https://forum.knime.com/u/jada)\
**Post date:** [February 2, 2011, 11:51am UTC](https://forum.knime.com/t/rdkit-one-component-reaction/1018/1 "2011-02-02T11:51:04Z")

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Hi at all,

I'm trying to use the RDKit One Component Reaction-node within the Variables Loop (Data)-node. I have a list of molecules, and reaction smiles as variables. The RDKit One Component Reaction-node works as long as it is disconnected to the Loop End-node. When I connect the nodes knime gives me the warning "WARN &nbsp;&nbsp; &nbsp; RDKit One Component Reaction&nbsp;&nbsp; &nbsp; reaction should only have one reactant, it has: 2" although I have only one reactant. So I tried the RDKit Two Component Reaction-node. It also works as long as it is disconnected to the Loop End-node and when I connect both nodes I receive the warning "WARN &nbsp;&nbsp; &nbsp; RDKit Two Component Reaction&nbsp;&nbsp; &nbsp; reaction should only have two reactants, it has: 1"

I don't know what I am doing wrong :S

Thanks for your help

jada

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**Author:** ![thor](https://forum-cdn.knime.com/user_avatar/forum.knime.com/thor/32/4_2.png) [@thor](https://forum.knime.com/u/thor)\
**Post date:** [February 2, 2011, 12:08pm UTC](https://forum.knime.com/t/rdkit-one-component-reaction/1018/2 "2011-02-02T12:08:02Z")

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Could you send me (Thorsten.Meinl@uni-konstanz.de) a small workflow that demonstrates your problem?

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**Author:** ![jada](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/j/bbe5ce/32.png) [@jada](https://forum.knime.com/u/jada)\
**Post date:** [February 2, 2011, 1:01pm UTC](https://forum.knime.com/t/rdkit-one-component-reaction/1018/3 "2011-02-02T13:01:22Z")

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sent it. thanks a lot

greetz

janette

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**Author:** ![system](https://forum-cdn.knime.com/uploads/default/original/1X/ab3ccf34482a0329361734a18199390177204f15.png) [@system](https://forum.knime.com/u/system)\
**Post date:** [April 21, 2023, 9:12pm UTC](https://forum.knime.com/t/rdkit-one-component-reaction/1018/4 "2023-04-21T21:12:11Z")

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