myrtenaln.

1907 Chem. Abstr. 1 1710 Chromic acid, in glacial acetic acid solution, converts myrtenol into myrtenal.

1971 Amer. Jrnl. Bot. 58 807 The occurrence of large quantities of myrtenal is of interest because of the relationship of this compound to alpha-pinene, which is readily oxidized to myrtenal by selenium oxide in ethanol.

1996 New Scientist 7 Sept. 30/2 The researchers have identified two substances that could do the same job as isothiocyanates without leaving farmers' eyes smarting... One of them, myrtenal, is characteristic of herbs such as mint, thyme, sage and rosemary and smells rather like pine trees.