(1S,3E,5S,6R,7S,8R,9R,10S,11R,13E,15Z)-9,11,31-trihydroxy-5-methoxy-1,6,8,10,16,30-hexamethyl-12-methylidene-1'-(2-methylpropyl)-17,27,33-trioxo-2',3',5',6'-tetrahydro-1'H-spiro[2,28-dioxa-18,21,23-triazapentacyclo[17.8.6.020,24.025,32.026,29]tritriaconta-3,13,15,19(20),23,25(32),26(29),30-octaene-22,4'-pyridine]-7-yl acetate