an Entity references as follows:
In enzymology, a sym-norspermidine synthase (EC 2.5.1.23) is an enzyme that catalyzes the chemical reaction S-adenosylmethioninamine + propane-1,3-diamine 5'-methylthioadenosine + bis(3-aminopropyl)amine Thus, the two substrates of this enzyme are S-adenosylmethioninamine and , whereas its two products are and bis(3-aminopropyl)amine.