α-Thujene-d3 is deuterium labelled α-Thujene (T405800). α-Thujene can be isolated fromTeucrium ramosissimum and Eucalyptus citriodora Hook. (Myrtaceae). It also exhibit antioxidant and anticancer activities against human tumor cells (hepatocellular carcinoma (liver) HePG-2, mammary gland (breast) MCF-7 and colorectal carcinoma (colon) HCT-116).