N1-(3-Aminopropyl)-1,4-butanediamine; N-(3-Aminopropyl)-1,4-butanediamine; 1,5,10-Triazadecane; 1,8-Diamino-4-azaoctane; 4-Azaoctane-1,8-diamine; N-(3-Aminopropyl)-1,4-diaminobutane; N-(3-Aminopropyl)-4-aminobutylamine; N-(4-Aminobutyl)-1,3-diaminopropane; Spermidin

Biogenic polyamine formed from putrescine, a precursor of spermine; essential for normal and neoplastic tissue growth, promoting T4 polynucleotide kinase. Acts as a neuronal nitric oxide synthetase inhibitor. Used in cancer research and cell culture media.