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JChem .NET API 25.3.4, issued by ChemAxon, exposes the full cheminformatics stack of JChem Base to Microsoft .NET ecosystems, letting developers embed structure searching, storage, and property prediction directly into C#, VB.NET, or ASP.NET applications without leaving the managed environment. The kit wraps native cheminformatics routines—substructure, similarity, exact-match, tautomer, and Markush queries; reaction enumeration; stereochemistry perception; logP, pKa, and H-bond descriptor calculation—into strongly-typed .NET classes that integrate with WinForms, WPF, or server-side code. GUI support is provided through the bundled MarvinSketch and MarvinView controls, so desktop programs can offer interactive structure drawing, editing, and visualization while still compiling to a single .NET assembly. Typical use cases include building compound registration systems, HTS data mining dashboards, ELN front-ends, knotted Excel add-ins for medicinal chemists, and REST micro-services that return JSON-formatted SAR tables. Because the library speaks the same cartridge formats used by the Java stack, organizations can swap between back-end engines without altering stored Oracle or PostgreSQL schemas. The current 25.3.4 milestone adds accelerated 64-bit memory mapping for billion-row reaction libraries, nullable reference annotations for C# 11, and NuGet deployment scripts that pin native run-times to the local x64 folder. Eight major versions have been released since the first public wrapper, each synchronizing with parallel Java and PostgreSQL cartridge updates to maintain bitwise consistency of search results across platforms. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e.g. winget), always delivering the latest version, and supporting batch installation of multiple applications.
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