  The multinucleon transfer reaction in the collisions of $^{40}$Ca+$^{124}$Sn
at $E_{\textrm{c.m.}}=128.5$ MeV is investigated by using the improved quantum
molecular dynamics model. The measured angular distributions and isotopic
distributions of the products are reproduced reasonably well by the
calculations. The multinucleon transfer reactions of $^{40}$Ca+$^{112}$Sn,
$^{58}$Ni+$^{112}$Sn, $^{106}$Cd+$^{112}$Sn, and $^{48}$Ca+$^{112}$Sn are also
studied. It shows that the combinations of neutron-deficient projectile and
target are advantageous to produce the exotic neutron-deficient nuclei near $N,
Z$ = 50. The charged particles emission plays an important role at small impact
parameters in the deexcitation processes of the system. The production cross
sections of the exotic neutron-deficient nuclei in multinucleon transfer
reactions are much larger than those measured in the fragmentation and
fusion-evaporation reactions. Several new neutron-deficient nuclei can be
produced in $^{106}$Cd+$^{112}$Sn reaction. The corresponding production cross
sections for the new neutron-deficient nuclei, $^{101,102}$Sb, $^{103}$Te, and
$^{106,107}$I, are 2.0 nb, 4.1 nb, 6.5 nb, 0.4 $\mu$b and 1.0 $\mu$b,
respectively.
