4-Methyl-benzenesulfonic Acid (2E)-[2-Methyl-5-(1-methylethenyl)-2-cyclohexen-1-ylidene]hydrazide-D4 is an intermediate used in the synthesis of (±)-Limonene-d5 (L461754), which is a deuterium labelled (+)-Limonene, which is used in the synthesis of Lavandulol (L195300), a compound in the cosmetics industry. In addition its used in the epoxidation of olefins.