5.6.9 Chemical compounds

According to T 954/05, the structural definition of a chemical compound may not be replaced in a claim by the mere juxtaposition of a feature purportedly representing a complete chemical structure and of a functional feature if:

- on the one hand the first feature comprises an indefinite number of compounds and there is no systematic selection rule based on the feature in question enabling the skilled person to identify the claimed compounds, and

- on the other hand the second, functional feature is not identifiable in the indefinite list of compounds potentially suitable for such a function because there is no indication of a typical standardised test for determining its presence or absence.

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