Diamine

A diamine is a type of polyamine with exactly two amino groups.

Examples include:
 * Diamines with linear carbon chain
 * ethylene diamine (2 carbon)
 * putrescine (4 carbon)
 * cadaverine (5 carbon)
 * hexamethylene diamine (6 carbon)
 * Other
 * ethambutol
 * phenylenediamine