GC-MS chromotograph of OVA essential oil in the period of pre-blossoming. 1: (+)-Sabinene, 2: β-Pinene, 3: α-Terpinolene, 4: Eucalyptol, 5: trans-β-Ocimene, 6: 1-Isopropyl-4-methyl-1,4-cyclohexadiene, 7: β-Ocimene, 8: Ethyl amyl ketone, 9: ο-Cymene, 10: trans-β-Terpineol, 11: Neo-allo-ocimene, 12: 3-Octanol, 13: p-Menthan-3-one, 14: Elixene, 15: (-)-β-Bourbonene, 16: β-Linalool, 17: β-Caryophyllene, 18: L-4-terpineol, 19: α-Humulen, 20: D-Germacrene, 21: α-Muurolene, 22: γ-Elemene, 23: 1-Isopropyl-4,7-dimethyl-1,2,3,5,6,8a-hexahydronaphtalene, 24: (R)-(+)-β-Citronellol, 25: β-Caryophyllene epoxide, 26: d-Viridiflorol, 27: Ent-Spathulenol, 28: 1-Methyl-4-(methylethyl)-(E)-2-cyclohexenol, 29: tau-Cadinol, 30: α-Cadinol, 31: 6-Isopropyl-4,8a-dimethyl-1,2,3,5,6,7,8,8a-octahydro-2-naphthalenol, 32: Methyl 1,5,5-trimethyl-6-[(1E)-3-methyl-1,3-butadienyl]-7-oxabicyclo[4.1.0.]hept-2-yl ether, 33: trans-Phytol, 34: Diepicadrene-1-oxide, 35: (3E)-4-(1,5-Dihydroxy-2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-one, 36: cis-Z-α-Bisabolene epoxide, 37: 3-[(2E)-2-Dodecenyl]dihydro-2,5-furandione, 38: Isoaromadendrene epoxide, 39: 2-Methyl-4-(2,6,6-trimethylcyclohex-1-enyl)but-2-en-1-ol. GC-MS: gas chromatography–mass spectrometry, OVA: Origanum vulgare of the Armenian highlands.