(A) Chemical structures of DIF-1, DIF-2, and THPH. DIF-1, 1-(3,5-dichloro-2,6-dihydroxy-4-methoxyphenyl)hexan-1-one; DIF-2, 1-(3,5-dichloro-2,6-dihydroxy-4-methoxyphenyl)pentan-1-one; THPH, 1-(2,4,6-trihydroxyphenyl)hexan-1-one. (B) Scheme of the coupling reaction for DIF-1-NH2 [6-amino-1-(3,5-dichloro-2,6-dihydroxy-4-methoxyphenyl)hexan-1-one hydrochloride] and Affi-Gel 10 resin. DIF–Affi-Gel 10 resin (DIF–beads) was prepared as described previously [18].