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The present study reports in vitro anti-sickling activity and phytochemical analyses of the leaves of Ocimum gratissimum. Biological testing revealed that the plant extracts possess antisickling effects. The combination of spectroscopic techniques: 1D-NMR, 2D-NMR and MS revealed that ursolic acid is the major biologically active compound of O. gratissimum (Silva et al. in Molecules 13:2482–2487, 2008;...