(1R,2'R,4S,5'S,6'S,8R,10E,13R,14E,16E,20R,21R,24S)-24-hydroxy-4'-[(E)-methoxyazanylidene]-5',11,13,22-tetramethyl-6'-[(2E)-4-methylpent-2-en-2-yl]-2-oxo-3',4',5',6'-tetrahydrospiro[3,7,19-trioxatetracyclo[18.3.1.14,8.017,24]pentacosa-10,14,16,22-tetraene-6,2'-pyran]-21-yl 4-nitrobenzoate