Hydroxyisohexyl 3-Cyclohexene Carboxaldehyde (jisko Lyral bhi kehte hain) ek synthetic fragrance compound hai jo pehle perfumes aur cosmetics mein bahut use hota tha. Iska scent floral aur lily-of-the-valley jaisa tha. Lekin kyunki iska sensitizing potential bahut zyada hai, isliye abhi log isko avoid karte hain kyunki skin irritation aur allergic reactions ho sakte hain.