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The synthetic route to PCTA-(ampOBu)3. Reagents and conditions: i) 1. 1,3,5-tribenzylhexa-hydro-1,3,5-triazine, 100 °C, 2. H2/Pd on C, EtOH ii) chloroacetyl chloride, diisopropylethylamine, dichloromethane, −97 °C; iii) pyclen, K2CO3, acetonitrile, 55 °C; iv) LiBr, 2-hexanone, 80 °C.
