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Abstract7‐Methoxy‐8‐(3‐methylbut‐2‐enyl)‐2‐chromenone (osthol) (OL) was modified to its acid derivative; 3‐(2,4‐Dimethoxy‐3‐(3‐methylbut‐2‐en‐1‐yl)phenyl)acrylic acid (OAD) via base catalysed ring opening mechanism. The structural properties, electronic spectra, single crystal analysis, with the support of density functional theory (DFT), have been investigated extensively. Furthermore, in vitro cell viability was carried out on different cancer cell lines.