The polycyclic compound (2R)-2-[(5R,9R,10R,13S,14S,16S,17S)-16-hydroxy-4,4,10,13,14-pentamethyl-3-oxo-1,2,5,6,9,11,12,15,16,17-decahydrocyclopenta[a]phenanthren-17-yl]-6-methylhept-5-enoic acid
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