urea + spermidine => N(1)-(3-aminopropyl)agmatine + H2O
urea + spermidine => n(1)-(3-aminopropyl)agmatine + h2o
urea + spermidine => N(1)-(3-aminopropyl)agmatine + H2O
urea + spermidine => n(1)-(3-aminopropyl)agmatine + h2o