Recently, fluorenylmethoxycarbonyl (Fmoc) amino acids (e.g. Fmocâtyrosine or Fmocâphenylalanine) have attracted growing interest in biomedical research and industry, with special emphasis directed towards the design and development of novel effective hydrogelators, biomaterials or therapeutics. With this in mind, a systematic knowledge of the structural and supramolecular features in recognition of those properties is essential. This work is the first comprehensive summary of noncovalent interactions combined with a library of supramolecular synthon patterns in all crystal structures of amino acids with the Fmoc moiety reported so far. Moreover, a new Fmocâprotected amino acid, namely, 2â{[(9Hâfluorenâ9âylmethoxy)carbonyl](methyl)amino}â3â{4â[(2âhydroxypropanâ2âyl)oxy]phenyl}propanoic acid or NâfluorenylmethoxycarbonylâOâtertâbutylâNâmethyltyrosine, FmocâNâMeâTyr(tâBu)âOH, C29H31NO5, was successfully synthesized and the structure of its unsolvated form was determined by singleâcrystal Xâray diffraction. The structural, conformational and energy landscape was investigated in detail by combined experimental and in silico approaches, and further compared to NâFmocâphenylalanine [Draper et al. (2015). CrystEngComm, 42, 8047â8057]. Geometries were optimized by the density functional theory (DFT) method either in vacuo or in solutio. The polarizable conductor calculation model was exploited for the evaluation of the hydration effect. Hirshfeld surface analysis revealed that HâŠH, CâŠH/HâŠC and OâŠH/HâŠO interactions constitute the major contributions to the total Hirshfeld surface area in all the investigated systems. The molecular electrostatic potentials mapped over the surfaces identified the electrostatic complementarities in the crystal packing. The prediction of weak hydrogenâbonded patterns via Full Interaction Maps was computed. Supramolecular motifs formed via CâHâŠO, CâHâŠÏ, (fluorenyl)CâHâŠCl(I), CâBrâŠÏ(fluorenyl) and CâIâŠÏ(fluorenyl) interactions are observed. Basic synthons, in combination with the LongâRange Synthon Aufbau Modules, further supported by energyâframework calculations, are discussed. Furthermore, the relevance of Fmocâbased supramolecular hydrogenâbonding patterns in biocomplexes are emphasized, for the first time.