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A. Structures of the FDA-approved drug AMD3100 and the small molecule antagonist IT1t. B. Structures of CXCR4 ligands based on the pharmacophores. Derivatives include B7, B8, B9, CX0298, and CX344. B8 and CX344 are compounds 18 and 25, respectively, in Wu et al (Wu et al., 2015b). B9 is compound 16 in Wu et al (Wu et al., 2015a).
