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Loading time is depending on the number of replacements observed.
A typical query takes between a couple of seconds to a minute.

We are analysing 65.7 million datapoints.
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⚠️ Important News
Due to the discontinuation of ChemAxon support for academic websites, SwissBioisostere will be modified to no longer rely on their software. During this period, the website, and notably the sketcher, might not be operational. We will do our best to ensure that this transition takes place with minimal disruption and inconvenience for our users. We thank you for your understanding.
I want to search for possible replacements of a fragment I want to get information on a given molecular replacement


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