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Structure formula of the novel taxane derivatives SB-T-121605 and SB-T-121606. Structures that differ from paclitaxel but are identical for new taxane derivatives are in blue. The different functional group between the two substances is in red—(A) SB-T-121605 and (B) SB-T-121606. Positions with synthetic modifications are in green (C-2, C-10, C-3′).
