MAOB and Alzheimer disease: The most abundant compounds reported in C. verum bark EO (Table 3) including δ-cadinene, t-cadinol, (E)-cinnamaldehyde, cinnamaldehyde dimethyl acetal, (E)-cinnamic acid, α-copaene, and α-muurolene were considered by an in silico approach to be investigated against AChE, BChE, BACE1, MAO-A, and MAO-B which are implicated in the pathogenesis of AD (Tables 4, 5, 6, 7 and 8).