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Major compounds identified in GC-MS analysis of essential oils from flower of Polygonum hydropiper (a) 1-methyl-4-(prop-1-en-2-yl)clohex-1-ene (b) O-Hexylhydroxylamine (c) 1-methyl-2,4-dl(prop-1-en-2-yl)-1-vinylcyclohexane (d) 1-methyl-4-(2-methyloiran-2-yl)-7-oxa-bicyclo(4.1.0)heptane (e) (-)-β-Caryophylleneepoxide (f) 1,1,2-trimethyl-3,5-di(prop-1-en-2-yl)cycloheaxane (g) (4E,7E)-1,5,9,9-tetramethyl-12-oxabicyclo[9.1.0]dodeca-4,7-diene
