4-deacetyl-4-(5-hexenoyl)baccatin III

acetic acid 2-(2-allyloxy-phenyl)-1-(4-methoxy-phenyl)-4-oxo-azetidin-3-yl ester

4-(2-allyloxy-phenyl)-1-(4-methoxy-phenyl)-3-triisopropylsilanyloxy-azetidin-2-one