  We propose a new type of structure for singly heavy baryons of $Qqq\bar{q}q$
in addition to the conventional one of $Qqq$. Based on chiral symmetry of the
light quarks, we show that the $Qqq\bar{q}q$ baryon offers a novel picture for
heavy quark spin-singlet and flavor-antisymmetric baryons. By making use of the
effective Lagrangian approach, we find $\Lambda_c(2765)$ and $\Xi_c(2967)$ are
mostly $Qqq\bar{q}q$ while $\Lambda_c(2286)$ and $\Xi_c(2470)$ are mostly
$Qqq$. The masses of negative-parity baryons are predicted. We also derive a
sum rule and the extended Goldberger-Treiman relation that the masses of the
baryons satisfy. Furthermore, a mass degeneracy of parity partners of the
baryons with the restoration of chiral symmetry is discussed. These are the
unique features that the conventional picture of radial excitation in the quark
model does not accommodate. Our findings provide useful information not only
for future experiments but also for future lattice simulations on diquarks.
