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Organic molecules are simply molecules with carbon atoms, excluding a few things like CO2, CO, metal carbides and cyanides. They don't have to be formed by living organisms, and indeed the organic molecules disovered by the curiosity rover were rather simple and could easily be formed by inorganic processes.

It is an interesting finding though. The question is, if there was/is life on mars, will we even discover it at all before we contaminate the planet with earthly organisms that destroy any indigenous ecosystem?