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(1aR,2R,3R,4aR,6S,7S,7aS,8Z,10R,11S,11aS)-1,1,3,6,9-pentamethyl-4-oxo-1,1a,2,3,4,6,7,10,11,11a-decahydro-5H-4a,7a-epoxycyclopenta[a]cyclopropa[f][11]annulene-2,7,10,11-tetrayl tetraacetate related products: