Three pimarane diterpenes isolated from the heartwood of Cleistanthus schlechteri var. Schlechteri have been identified as ent-isopimara-8(14),15-dien-3β-ol, ent-3β-hydroxyisopimara-8(14),15-dien-12-one, and ent-isopimara-8(14),15-dien-3β,12β-diol. These three diterpenes are congeners of the aromatic diterpene cleistanthol.