organic cation ammonium ion derivative alkane-alpha,omega-diamine alkane-alpha,omega-diammonium(2+) an alkane-alpha,omega-diamine An organic cation obtained by protonation of the amino groups of any alkane-alpha,omega-diamine; major species at pH 7.3. (CH2)n.C2H10N2 chebi_ontology +2 CHEBI:70977