A new chromanone acid from the bark of Calophyllum dryobalanoides

► Calodryobalanoic acid was isolated from the bark of Calophyllum dryobalanoides. ► Structural solution was supported using DFT calculations, IR and NMR data. ► DFT calculations showed that calodryobalanoic acid had two almost perpendicular parts. ► Interesting intramolecular hydrogen bonds are found.