Structural

http://www.chemaxon.com/marvin/ (Rank: 311819)

http://www.chemie.uni-erlangen.de/ccc/hommes/molecule/ (Rank: 2081154)

http://www.mathe2.uni-bayreuth.de/molgen4/ (Rank: 2169024)

http://web.interware.hu/frenzy/mol2mol/index.html (Rank: 2406192)

http://www.hyleos.net (Rank: 2651713)

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