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

4-deacetyl-4-acryloyl-10-deacetylbaccatin III

4-(2-but-3-enyloxy-phenyl)-3-hydroxy-1-(4-methoxy-phenyl)-azetidin-2-one

4-deacetyl-4-acryloylbaccatin III

(3R,4S)-1-benzoyl-3-O-triisopropylsilyloxy-4-(o-(but-3-enyloxy)phenyl)azetidin-2-one