The marine molluskAplysiadactylomela is the source of two new brominated sesquiterpenes, lankalapuol A and B (, ). Characterization is based on the spectral data of their acetates (, ). The absolute stereochemistry of lankalapuol A acetate, (6) acetoxy-(1)bromo-(5,7.10)eudesm-3-ene, is based on X-ray analysis. The two lankalapuols are antipodal -fused eudesmanes.