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Correlation spectroscopy spectrum of 24-methylenecycloartanyl ferulate (a), heteronuclear single quantum coherence spectrum of isolated 24-methylenecycloartanyl ferulate (b), heteronuclear multiple bond correlation spectrum of 24-methylenecycloartanyl ferulate (c), and nuclear overhauser effect spectroscopy spectrum of 24-methylenecycloartanyl ferulate (d)
