THE TITLE COMPOUND (COMMON NAME: 3β-acet-oxy-8-epi-sclareolide), C(18)H(28)O(4), is a sclareolide derivative, which was synthesized from 9(11)-en-3β-acet-oxy-8-epi-sclareolide. In the mol-ecular structure, the two six-membered rings display chair conformations and the five-membered ring displays an envelope conformation. Weak inter-molecular C-H⋯O hydrogen bonding is present in the crystal structure.