Derivatization of ophiobolin A and cytotoxicity toward breast and glioblastoma cancer stem cells: Varying the ketone and unsaturated aldehyde moieties. - Aroujo J; Parker H; Boari A; Mason E; Otakpor MU; Betancourt T; Kornienko A; Ciavatta ML; Carbone M; Evidente A; Taube JH; Romo D (Bioorganic & medicinal chemistry letters, 2025)