the unique species contains uridine ( u ) in place of dihydrouridine-16 ( d16 ) , isopentenyladenosine in place of 2-thiomethyl-n6- ( delta2-isopentenyl ) adenosine-37 , a mixture of u and pseudouridine ( psi ) in position 39 , a mixture of u and 3- ( 3-carboxypropyl ) uridine at position 47 , and a mixture of u and psi at position 55 .
C0041984
uridine
C0033846
psi