The base in the pseudouridine molecule is not real uracil, but a derivative of uracil? Is this sentence correct or wrong?

Judging from the definition of derivatives, this sentence is correct

Refers to the compound formed by replacing atoms or atomic groups in the parent compound molecule with other atoms or atomic groups, which is called Derivatives of the parent compound.

The C5 and N1 groups of pseudouracil are different from uracil, so it can be called a derivative.