Because of the multilanguage support and intuitive user interface, the software should especially appeal to students in secondary and tertiary education. Molecules can be inserted using line notation (InChI, MCDL, and SMILES) and molecular metainformation such as IUPAC name and Chemical Abstracts Service number can be obtained from drawings via online NIH CACTUS queries. cDraw sessions can be stored in the XML-based CDML file format additionally, there are basic import–export capabilities for the popular CDXML, CML, and SDF file formats. Drawings can be exported as EPS, PDF, PNG, SVG, and TIFF images or copied through the clipboard. The software allows drawing of 2D chemical-structure diagrams using a basic set of built-in templates and bond-generation mechanisms. The user interface has been designed with a clear focus on intuitive and convenient handling and is currently offered in nine languages. The Java desktop application cDraw is an interactive chemical-drawing software for the generation of publication-quality figures.
Although a number of free chemical-drawing applications are currently available, there are often limitations as to the included basic drawing tools, ease of handling and installation, or time limits of free access. For educational purposes in particular, the existence of suitable software tools free of charge is of great importance. The interactive generation of chemical-structure diagrams is an integral activity in the study of chemistry as well as in professional chemistry environments. Testing of the upgraded MCDL Java Chemical Structure Editor on compounds taken from several large and diverse chemical databases demonstrated satisfactory performance for storage and processing of stereochemical information in MCDL format. The paper also contains additional discussions regarding canonical representation of stereochemical isomers, and brief algorithm descriptions of the open source LINDES, Java applet, and Open Babel MCDL processing module software packages. In this paper we present MCDL modules and accompanying software that incorporate unique representation of molecular stereochemistry based on Cahn-Ingold-Prelog and Fischer ideas in constructing stereoisomer descriptors. A subsequent development was the MCDL Java Chemical Structure Editor which is capable of drawing chemical structures from linear representations and generating MCDL descriptors from structures. In our previous papers we introduced the Modular Chemical Descriptor Language (MCDL) for providing a linear representation of chemical information.
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