Structure Checker History of Changes

    LTS Release - October 18th, 2019: 19.21.1 Structure Checker (Europium.1)

    No changes

    LTS Release - April 11th, 2019: 19.7.1 Structure Checker (Deuterium.1)

    No changes

    October 9th, 2018: Structure Checker 18.24.0


    • Pipe errors of Structure Checker

    LTS Release - September 25th, 2018: 18.22.1 Structure Checker (Carbon.1)

    No changes

    February 13th, 2018: Structure Checker 18.4.0


    • Command Line Interface problem: Only the user interface can be started from command prompt.

    August 1st, 2017: Structure Checker 17.18.0


    • Overlapping Atom Checker does not detect those atoms which are just too close but actually do not overlap.

    October 3rd, 2016: Structure Checker 16.10.3


    • Multicenter Checker will not detect the endpoint of a position variation bond as multicenter.

    September 26th, 2016: Structure Checker 16.9.26


    November 9th, 2015: Structure Checker 15.11.9

    Improvements, deprecations

    August 24th, 2015: Structure Checker 15.8.24


    • Additional improvements in Wedge Error Checker and Clean Wedge Fixer.

    August 3rd, 2015: Structure Checker 15.8.3

    API changes

    • chemaxon.checkers.runner.BasicCheckerRunner was removed from the public API. Use [AdvancedCheckerRunner](

    July 6th, 2015: Structure Checker 15.7.6


    • Wedge Error Checker didn't detect non-stereo wiggly bonds.


    • Clean Wedge Fixer converts non-stereo wiggly bonds to single bonds.

    June 22th, 2015: Structure Checker 15.6.22


    • Solvent Checker threw exception if input molecule couldn't be converted to SMILES format.

    April 13th, 2015: Structure Checker 15.4.13

    New features

    January 26th, 2015: Structure Checker 15.1.26


    • Wedge Error Checker didn't always agree with Wedge Clean Fixer . From now on the molecules fixed by Wedge Clean Fixer are accepted as correct by Wedge Error Checker.

    January 12th, 2015: Structure Checker 15.1.12


    • Aromaticity error fixing improvements: Dearomatize and Rearomatize fixers can fix aromaticity errors in heteroaromatic rings (containing only carbons and nitrogens) in unambiguous cases. images/download/attachments/5313431/dearomatize_fixer_improvements.png


    • Bond Angle Checker did not accept some bond angles as correct. Bonds connected to a ring were affected.

    January 5th, 2015: Structure Checker 15.1.5


    • From now on Rare Element Checker will not detect deuterium (D) and tritium (T) as rare element.

    November 17th, 2014: Structure Checker 14.11.17


    • Chiral Flag Error Checker did not report invalid chiral flag on achiral molecules.

    October 27th, 2014: Structure Checker 14.10.27

    New features and Improvements

    • New checker: R-group Bridge Error Checker.

    • R-group Attachment Error Fixer improvements:

      • removes superfluous attachment points,

      • can fix errors in R-group definitions having multiple equivalent candidates for the addition or removal of the attachment point(s),

      • can fix structures containing contracted abbreviated groups,

      • can handle R-group bridges.

    October 6th, 2014: Structure Checker 14.10.6


    • Circular R-group Reference Checker failed to identify some circular references

    • Missing R-group Checker did not identify unnumbered R-group as missing

    July 21th, 2014: Structure Checker 14.7.21

    New features and Improvements

    • OCR Error Checker was improved, now it identifies optical structure recognition errors better

    • "Discard OCR errors" option was removed from Structure Checker application and structurechecker command line application. Use OCR Error Checker.


    • Overlapping Bond Checker detected some non-overlapping bonds as overlapping [error report]

    July 7th, 2014: Structure Checker 14.7.7

    New features and Improvements

    • Less invasive fix of bond length errors and bond angle errors with newly introduced Bond Length Fixer and Bond Angle Fixer .

    Please visit this page for History of changes relating older Marvin versions.