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The bat coronavirus spike protein, however, differs from SARS-CoV-2s spike protein within a key region called the receptor-binding domain (RBD)

Although N-acetylcysteine (NAC) directly influences the pool of extracellular cystine and intracellular cysteine via a series of plasmatic redox reactions, in order to be effective, intracellular cysteine precursors must be designed to enter erythrocytes rapidly and use high activity enzymes within erythrocytes to liberate cysteine (Whillier et al., 2009

doi:10.1080/00913847.2016.1135037 Wang W, Li J, Ji P, Bian R, Xiong Y

The site of action of these drugs in the respiratory tract is controversial