(2alpha,5beta,7beta,10beta,13alpha)-4-(acetyloxy)-13-{[(2R)-3-(butanoylamino)-2-hydroxy-3-phenylpropanoyl]oxy}-1,10-dihydroxy-9-oxo-7-(L-xylopyranosyloxy)-5,20-epoxytax-11-en-2-yl benzoate