Macrocyclic aza analogue of the crown ether 12-crown-4. Cyclen compounds are capable of selectively binding cations and are used as a ligand with chemicals used in MRI contrast (as well ass other imaging) agents.Appearance:White to pale yellow powderPurity:≥98%Melting Point:110-112ºC Solubility:Chloroform, MethanolMethod for Determining Identity:Proton NMR (CDCl3) Spectroscopic analysis and Mass Spectrometric analysisStorage and Stability:May be stored at RT for short-term only. Long-term storage is recommended at 4°C. For maximum recovery of product, centrifuge the original vial prior to removing the cap. Store under inert atmosphere.