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(a) Main directional intermolecular interactions (N–H···O hydrogen bonds) of the carbamate group observed in the crystal structure of FAM-DA-3CH2 and the corresponding intramolecular HB interactions in FAM-PDA-3CH2. (b) Positional difference of the main C–H···π interactions present in FAM-DA-3CH2 and FAM-PDA-3CH2. Displacement ellipsoids are drawn at the 40% probability level.
