Benzenepropanoic acid, β-(benzoylamino)-a-hydroxy-, 4,6,12b-tris(acetyloxy)-12-(benzoyloxy)-2a,3,4,4a,5,6,9,10,11,12,12a,12b-dodecahydro-11-hydroxy-4a,8,13,13-tetramethyl-5-oxo-7,11-methano-1H-cyclodeca[3,4]benz[1,2-b]oxet-9-yl ester, [2aR-[2aa,4β,4aβ,6β,9a(aR*,βS*),11a,12a,12aa,12ba]]-, Paclitaxel Impurity L