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Chemical structure of dye molecules and their calculated van der Waals diameters in a scale bar; (a) MB (blue sphere on scale bar), (b) RDB (red sphere), (c) BBG (black sphere), (d) BPA (grey sphere) and (e) 4-NP (green sphere). The min and max subscripts indicate minimum and maximum projection diameter of dyes, respectively. pore size (star) indicates three accessible pore sizes existing in COP-99.
