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I am not quite sure what ‘(A)’ could mean for the carbon atom when writing the SMARTS CCN(C)C using Chemicalize to draw the chemical structure below. Can anyone help?

N,N-dimethylethylamine

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According to Daylight Chemical Information Systems — SMARTS Theory Manual and Chemaxon docs — SMARTS, the capital letter ‘A’ in SMARTS notation is a label for an aliphatic primitive (atom).

Chemaxon’s JChem query puts requested SMARTS atom properties in braces next to the corresponding atomic labels when drawn with Marvin.

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