Irina Oshchepkova
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Articles
Recent activity by Irina Oshchepkova-
Katalyst: Specific user cannot log in
DescriptionA single user is unable to log into Katalyst. Common causes include an incorrect or expired password, especially when the Katalyst password is the same as the user’s PC password, or miss...
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Percepta: Drawing R‑group Structures in Percepta vs. ChemSketch
DescriptionIn Percepta, R‑groups are represented directly using the R1 label (for example, c1ccccc1[R1]).In ChemSketch, R1 is not recognized as a generic R‑group in SMILES. Instead, use an asterisk...
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Katalyst: How experiment backups work
DescriptionThis article explains how to backup your experiment. SolutionWhat backups contain:A snapshot of the experiment’s configuration and associated data at the time the backup was created (sub...
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Katalyst: Starting page is not displayed
DescriptionWhen users attempt to open the Katalyst page, the starting page does not load. This issue typically occurs when the Apache Tomcat service on the Katalyst Web Server is not running or the...
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ChemSketch: Molfile Text Instead of Structure When Pasting from ChemSketch into Excel
DescriptionWhen copying a chemical structure from ChemSketch and pasting it into Excel, the pasted content appears as Molfile text rather than as a graphical structure.SolutionIn the ChemSketch win...
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ChemSketch: How to draw an electron pair (Lewis structure)
DescriptionLewis structures and mechanism diagrams often require lone pairs or electron pairs shown as dots. ChemSketch includes electron pair symbols in template sets such as Lewis Structures or R...
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ChemSketch: How to draw H-bonds
DescriptionHydrogen bonds are often represented as dashed or special coordinating bonds between donor and acceptor atoms. ChemSketch provides coordinating/dashed bond tools and also supports creati...
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ChemSketch: Switching Polypeptide α‑Helices from Right‑Handed to Left‑Handed
DescriptionIn peptide drawings, you may need to flip the orientation of helices or the entire chain. ChemSketch provides several flip options that can be applied to the selected structure to change...
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ChemSketch: How to draw an arrow for a null reaction in ChemSketch
DescriptionNull reactions (no reaction occurred) are often indicated using a crossed-out reaction arrow. ChemSketch doesn’t provide a built-in “null reaction” symbol, but you can easily construct o...
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ChemSketch: Drawing Molecules with Open (Terminal) Bonds in Polymer Notation
DescriptionPolymer structures are often represented with “open” ends (no explicit terminal group label), to indicate repeating units. In ChemSketch, you can simulate this by hiding terminal labels ...