Asclepiadin;Asclepin; Card-20(22)-enolide,2,3-[[4-(acetyloxy)tetrahydro-3-hydroxy-6-methyl-2H-pyran-3,2-diyl]bis(oxy)]-14-hydroxy-19-oxo-,[2a(2S,3S,4S,6R),3b,5a]-
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