A sesquiterpene, probably tricyclic, has been found in Heer-abol myrrh oil by O. v. Friedrichs3) and designated heerabolene by him.

B. p. 130 to 136° (16 mm.); d20o0,943; aD14°12'; nD20o1,5125; mol. refr. 64,98.

Neither a characteristic bromide, nor a solid nitrosochloride or nitrosate could be obtained. With hydrogen chloride, however, a dihydrochloride melting at 98 to 99° resulted. As is the case with the sesquiterpene of galangal oil, the hydrogen chloride appears to have caused the cleavage of a cycle.