Simplified versioning scheme

One giant leap for us, one small change for you – changing our version numbers

Three years ago ChemAxon changed its release method. Based on your feedback and our experience, we have planned several improvements in the process. Among various technical changes, the current versioning, based on date stamp, will be replaced with a simpler scheme using only two numbers.

What does this mean for you? You probably won’t even realize the new change. Here is an example:


The last release with the old versioning was 17.4.3. The upcoming releases will be numbered as 17.5, 17.6, 17.7, etc. This change affects all products that have common version number (e. g.: Marvin and JChem suites, Instant JChem, JChem for Office or ChemCurator).

If you have any questions, please leave a comment below.

ChemAxon Maven Repository

Apr 7, 2017István Őri

We are happy to announce that ChemAxon provides a new Maven repository to integrate some of our products and modules. The repository is designed for integrators and resellers, but available for any registered ChemAxon user.

You can find the documentation and quickstart project examples here. A more complex solution with detailed documentation is available at public JKlustor web example project.

If you need help or experience any trouble, please open a ticket here.

Cheminformatics boosters: ChemAxon's partnership with IDBS

Jul 20, 2016János Fejérvári

ChemAxon, almost 2 decades ago, started as a toolkit company. We created easily integrable software that supports a wide range of technological environment and chemical format, while keeping it scientifically accurate. This business scope is changing lately. We started to focus on web-based applications providing an end-to-end solution for scientific workflows. Yet, partnering plays an important role in ChemAxon’s strategy. We believe that combining industry knowledge is able to push R&D forward, and that we can create an ‘out of the box’ solution reducing the burden on customer IT groups. Currently we have more than 100 partners worldwide, who have integrated ChemAxon technology. Read the whole post »

Java Applet Technology: The Past and Future and The End

Java Applet technology was a great tool to create nice and shiny applications that can be embedded into websites. It even had the ability to communicate with JavaScript through custom APIs. It was fun, people were happy.

But time went by, web based technologies evolved and the browsers adopted the changes. The plugin technologies (Flash, Silverlight, Java, ActiveX, etc.) were pushed back by JavaScript, CSS, and HTML5. The security issues in plugin based technologies did not help either by opening backdoors for malware and flooding the users with alert windows. Read the whole post »

Are we there yet?

About 18 months ago we published “MarvinSketch: on the way towards publication quality drawing”. Although the blog post was the trailing subsequence of the newly introduced label editor, the work has been started way before that and as you would expect it is going ever since. Now we believe the time is right to review the above statement and briefly summarise where we are.

Read the whole post »

Did you know... ? A series of videos about ChemAxon's MarvinSketch and Marvin JS tools

MarvinSketch, our chemical editor, was among the first software ChemAxon started to develop. We have been continuously working to make it one of the most chemically-intelligent tool on the market. This is a great heritage that Marvin JS, our JavaScript based drawing tool could take over.

Throughout the development we added some really amazing features that can speed up your work. We wanted to throw some light on these smart details in a series of short videos.

Since mid October, every Thursday we post a brief tutorial to our YouTube channel, showing these hidden treasures in MarvinSketch and Marvin JS. At the time of writing there are 6 videos available, focusing on stereoisomer handling, keyboard shortcuts, quick peptide and reaction drawing.


We hope you will find these videos useful. Have a great time while watching.
If you have a thrilling idea to make video of, share with us and leave a comment down here.

Drawing complex biomolecules as easily as small molecules?

ChemAxon’s BioEditor

Recent exciting advances and innovations at the chemistry-biology interface has sparked us to bridge the gap between chemistry and biology and create our Biomolecule Toolkit.

The next step is to provide a biological sibling for our well established chemical editor, the Marvin. ChemAxon’s new, web-based BioEditor is to handle those complex macromolecules that are tagged by the relatively newly coined terms like “biologics, biologicals or biopharmaceuticals”, and also to add our industry-leading chemical intelligence to them.

To develop the closest editor to your needs, we would like to invite you to join us and meet at the starting line. Please help us to shape our new BioEditor by filling in this short, 5-minute survey.

JChem Base, JChem Oracle Cartridge: Speed-up of combined searches

New improvements in our search algorithm result speed-up of search cases when chemical structure search is combined with non-structural criterion.

Combined, structural and non-structural compound query in SQL using JChem Oracle Cartridge  (JOC) can be defined as:

SELECT * FROM tableName WHERE jc_compare(‘CCC’, cd_structure, ‘t:s’) AND id<4000.

Read the whole post »

MarvinSketch: on the way towards publication quality drawing

A new tool, the label editor has been introduced recently in MarvinSketch version 14.11.10.

This allows MarvinSketch users to edit and format labels easily. It effects the labels of atoms, abbreviated groups, R-groups, atom lists/not lists and also the introduction of an alias or a pseudo atom.

Read the whole post »

More smart tools in Marvin JS

We do our best to create tools which are useful and help make your work faster and easier. One area we see much potential is in user interaction and simplifying tasks toward being intuitive. In the Marvin JS team we realized that sometimes the easiest ways are not the most trivial and complex problems can require complex solutions.

But what is the best way to illustrate or achieve tool behavior with actual chemists? Documentation, tutorials, consultancy? One solution we are exploring is an option to insert some “live hints” or guides into Marvin JS which appear as you draw chemistry. See below for 5 different examples of the guides in action but we are asking for your opinion here – does it feel natural, is it confusing, is there a better way? Does the hint reflect your idea about the physical behavior of the tool?

multicoordinatebond Drawing coordinate bonds


straightarrow Reaction & mapping


freehanddrawingFreehand drawing


eflowSingleArrowSelecting electron flow arrow arrow types


smartrgroup R-group handling


You can try these features in Marvin JS:

Tell us your opinion of this potential solve, is it relevant, does it work, how does it not work. Please take a minute to tell us if this is a good way forward by posting a comment.