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1H-nuclear magnetic resonance of isolated 24-methylenecycloartanyl ferulate (a), 13C-nuclear magnetic resonance of isolated 24-methylenecycloartanyl ferulate (b), distortionless enhancement by polarization transfer spectrum of isolated 24-methylenecycloartanyl ferulate (c) and heteronuclear multiple bond correlation of the isolated compound (i.e. heteronuclear multiple bond correlation [H–C]) (d)
