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Every commutator preserving bijection of the unipotent radical $Up(2n, R)$ ofthe Borel subgroup of the classical symplectic group of rank at least 4 over afield $F$ such that $6F=F$ is shown to be the composition of a standardautomorphism of $Up(2n,R)$ and a central map. The latter is a bijection whichacts as the right multiplication by a matrix from the center of $Up(2n,F)$.

Bijective PC-maps of the unipotent radical of the Borel subgroup of the classical symplectic group