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The geometry around C-2 in the paclitaxel baccatin core: bond angles θ1 (C1-C2-C3), θ2 (C2-O-C(=O)) and θ3. The latter measures from the bisector (b) of C-1 and C-3 to the ester O (i.e. (b-C2-O)). Variable d corresponds to the distance from C-2 to the centroid of C-1, C-3 and O.
