label: S-adenosyl 3-(methylsulfanyl)propylamine + propane-1,3-diamine <=> norspermidine + S-methyl-5'-thioadenosine + H(+)
label_lc: s-adenosyl 3-(methylsulfanyl)propylamine + propane-1,3-diamine <=> norspermidine + s-methyl-5'-thioadenosine + h(+)