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(5'S,6R,6'R,11R,13R,15S,17aR,20aS,20bS)-6'-ethyl-20b-hydroxy-5',6,8,19-tetramethyl-3',4',5',6',10,11,14,15,20a,20b-decahydro-2H,7H-spiro[11,15-methanofuro[4,3,2-pq][2,6]benzodioxacyclooctadecine-13,2'-pyran]-17,20(6H,17aH)-dione