Chemical Name: Paclitaxel Oxetane Ring-Opened 3-Acetyl 4-Benzoyl Impurity ; (1S,3S,4S,4aR,5S,6S,8S,11R,12aS)-8-(((2R,3S)-3-benzamido-2-hydroxy-3-phenylpropanoyl)oxy)-4-((benzoyloxy)methyl)-1,4,5,6-tetrahydroxy-9,12a,13,13-tetramethyl-12-oxo-1,2,3,4,4a,5,6,7,8,11,12,12a-dodecahydro-6,10-methanobenzo[10]annulene-3,11-diyl diacetate