Wikipedia:  

Spermidine

1,4-Diaminobutane, N-(3-aminopropyl)-; 1,4-Butanediamine, N-(3-aminopropyl)-; 1,5,10-Triazadecane; 4-Azaoctamethylenediamine; Spermidine; N-(3-Aminopropyl)-1,4-butane-diamine; SPERMIDINE
Molecular Formula
C7 H19 N3
Natural Isotopic Abundance Mass
145.2458600000
Mono-Isotopic Molecular Masses
C12N14:   145.157897625
C13N14:   152.18138149
C12N15:   148.149002305
C13N15:   155.1724861697
Spermidine image
Spermidine
InCHi String:
InChI=1S/C7H19N3/c8-4-1-2-6-10-7-3-5-9/h10H,1-9H2

isomeric and canonical SMILES:
C(CCNCCCN)CN


IUPAC
N-(3-aminopropyl)butane-1,4-diamine



PubChem Substance (SID):   85164951   173341   3609
PubChem Compound (CID):   1102
KEGG: Compound ID   C00315
CAS Registry IDs:   124-20-9
PDB Chemical Component   SPD
Miscellaneous Databases and IDs:   CHEBI 16610   EINECS 204-689-0   Beilstein Handbook Reference 4-04-00-01300

Reference data were obtained primarily from the PubChem database.

Three dimensional molecular rendering uses Jmol.