On Jul 29, 2011, at 7:31 PM, Jimmy G Lafontaine Rivera wrote:

> I have one more question. Is there anyway to differentiate between a ketone 
> and an aldehyde in a substructure search?

Sure. See, for example: 
http://www.daylight.com/dayhtml_tutorials/languages/smarts/smarts_examples.html#GROUP

Ketone (specific):
[#6][CX3](=O)[#6]

Carbonyl (with carbon) -- less specific:
[CX3](=[OX1])C

-Geoff
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