Converts the structural formula into a 3d model. This page uses the jsme molecular editor, which may be used for free under terms of the bsd licence. Using the input to the left you can build a reactant by hand.
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Machine builds druglike organic molecules in a snap Science AAAS
There is a button in the middle that allows.
Web this kit will allow construction of organic molecules with sigma and pi bonding depicted, using atom centres with the appropriate geometry and sections of tubing to represent.