Ligand Drug Conjugates of hydrophobically-modified auristatin F compounds that exhibit cytotoxic activities towards targeted cells, including abnormal cells such as cancer cells, that are MDR+while also exhibiting bystander activities towards nearby cells having lower expression of the moeity targeted by the Conjugate.本發明係關於疏水性改質奧瑞他汀F化合物之配位體藥物結合物,其展現對為MDR+之靶細胞的細胞毒性活性,該等靶細胞包括諸如癌細胞之異常細胞,同時亦展現對附近細胞的旁觀者活性,該等附近細胞具有會被該結合物靶向之較低表現的部分。