label: norspermidine + S-adenosyl 3-(methylsulfanyl)propylamine => norspermine + S-methyl-5'-thioadenosine + H(+)
label_lc: norspermidine + s-adenosyl 3-(methylsulfanyl)propylamine => norspermine + s-methyl-5'-thioadenosine + h(+)