  Adopting the one-boson-exchange model, we perform a systematic investigation
of interactions between a doubly charmed baryon $(\Xi_{cc})$ and an $S$-wave
charmed baryon ($\Lambda_c$, $\Sigma_c^{(*)}$, and $\Xi_c^{(\prime,*)}$). Both
the $S$-$D$ mixing effect and coupled-channel effect are considered in this
work. Our results suggest that there may exist several possible triple-charm
deuteron-like hexaquarks. Meanwhile, we further study the interactions between
a doubly charmed baryon and an $S$-wave anticharmed baryon. We find that a
doubly charmed baryon and an $S$-wave anticharmed baryon can be easily bound
together to form shallow molecular hexaquarks. These heavy flavor hexaquarks
predicted here can be accessible at future experiment like LHCb.
