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\label{fig:setup} Illustration of the anisotropy measurements. (a) Schematic diagram of the experimental setup. The sample solution sample, i.e. the drug in solution,  was placed on a confocal microscope stage and excited with a polarised, pulsed laser. The fluorescence from the sample was reflected from a dichroic mirror (DM) and recorded with a hybrid photodetector (HPD). (b) Schematic of the fluorescence decays in parallel and perpendicular polarisation directions, from which the anisotropy (c) was calculated with eq~\ref{eq:anisotropy}.