AbstractThe absolute oil of cassie (Acacia farnesianaWILLD.) has been thoroughly investigated by using several combined chromatographic techniques. Among the 38 new constituents which were thus identified in this oil, four deserve a particular mention, namely, thecis‐3‐methyldec‐3‐en‐1‐ol (I), the related acid III, thetrans‐3‐methyl‐dec‐4‐enoic acid (IV), and the homoterpene lactone dihydroactinidiolide (II). With the exception of the last one, these unusual C11compounds play a prominent role in the characteristic fr