“…During the first two decades of the 21st century, special attention was paid to the synthesis and bioassay of ferrocene derivatives carrying pharmacophoric groups, namely, nucleic bases, oligonucleotides, various heterocycles, amino acids, peptides, and sugars . In vitro and in vivo studies have demonstrated that many of such modified ferrocenes display a wide spectrum of biological activities, including antianemic, antimicrobial, antibacterial, antimalarial, tuberculostatic, and especially antitumor activities, see recent review articles . Ferroceron (tetrahydrate of sodium salt of ortho ‐carboxybenzoyl ferrocene), which is the first and only currently ferrocene‐based drug, has been effectively used for a long time for the treatment of iron deficiency pathologies .…”