A very powerful alternative by ACD/Labs. It includes 3D viewing features that the old ISIS/Draw lacked. MarvinSketch:
For your safety, I recommend avoiding any "free download" sites for Isis Draw 2.5 and instead exploring the legally accessible, up-to-date alternatives mentioned above. Download Isis Draw 2.5 Free
Uses MDL’s CTfile formats (Molfile, RXNfile, and SDfile), ensuring compatibility with many modern chemical databases. A very powerful alternative by ACD/Labs
: On newer versions of Windows (64-bit), you may need to run the installer or the program in Compatibility Mode (e.g., Windows XP or Windows 7). Quick Start Guide to Drawing Uses MDL’s CTfile formats (Molfile, RXNfile, and SDfile),
Support for Object Linking and Embedding (OLE), allowing you to paste structures directly into Microsoft Word or PowerPoint while keeping them editable.
By downloading Isis Draw 2.5 for free, you can take advantage of its powerful features and benefits, and improve your productivity and accuracy in chemical structure drawing.