Description General description cis-4-Decenal has been identified as one of the volatile biological marker for grey mold (Botrytis cinerea) infections in strawberry. Application cis-4-Decenal is suitable for use as standard compound to investigate the release of odorants in hydrocolloid model systems containing original or regio-selectively carboxylated cellulose at different pH values using static headspace gas chromatographic (SHS-GC) analysis. cis-4-Decenal may be used as standard for the standardization of 9-decenal by gas-chromatography. It may be used in the preparation of cis-4-decenol. Packaging 1 g in glass bottle