guajadials c - f ( 14 ) , four sesquiterpenoid - based meroterpenoids with unprecedented skeletons were isolated from the leaves of psidium guajava .
their structures and relative configurations were established by extensive spectroscopic analysis . a possible biosynthetic pathway for 14 was also proposed .
supplementary material is available for this article at 10.1007/s13659 - 012 - 0102 - 4 and is accessible for authorized users .
 abstractguajadials c - f ( 14 ) , four sesquiterpenoid - based meroterpenoids with unprecedented skeletons were isolated from the leaves of psidium guajava . 
 their structures and relative configurations were established by extensive spectroscopic analysis . 
 a possible biosynthetic pathway for 14 was also proposed.graphical abstractelectronic supplementary materialsupplementary material is available for this article at 10.1007/s13659 - 012 - 0102 - 4 and is accessible for authorized users . 
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