Pseudouracil nucleoside is composed of C-5 of uracil connected to ribose, while uracil nucleoside is composed of N-1 of uracil connected to ribose
Pseudouracil can The hydrogen bond formed is the same as that of uracil, see picture
mons/thumb/4/4a/Synthesis_of_Pseudouridine.svg/400px-Synthesis_of_Pseudouridine.svg.png