Benzenepropanoic acid, β-(benzoylamino)-α-hydroxy-, 2a,8-bis(acetyloxy)-3-(benzoyloxy)dodecahydro-4,10-dihydroxy-7,9a,12,12-tetramethyl-9-oxo-3H-4,7a-methanocyclohept[3,3a]indeno[5,4-b]oxet-6-yl ester, [2aS-[2aα,2bS*,3α,4α,6α(αS*,βR*),7β,7aβ,8β,9aβ,10β,11aα]]-,Paclitaxel Impurity