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However, if you are looking for powerful chemical structure drawing tools without the headache of tracking down an old serial key, here are the best modern (and legal) ways to go about it: 1. The Modern Successor: KnowItAll

Grab the ACD/ChemSketch Freeware . It handles the same file types and is much more stable on today's hardware.

If you just need to draw structures for a paper or lab report right now, these are incredible, free, and won't put your computer at risk:

A great web-based option if you don't want to install anything at all. Why avoid the "Free Download" sites?