3-tert-butoxycarbonylamino-2-hydroxy-3-phenyl-propionic acid 14,20-dihydroxy-8-methoxy-7,13,15,17,19,21-hexamethyl-22-(1-methyl-penta-2,4-dienyl)-2-oxo-oxacyclodocosa-3,5,11,16-tetraen-10-yl ester