8 отворена форма (ADR- 925), която е със структура, подобна на EDTA, и е силен хелатор на желязо и двувалентни катиони като калциеви йони.
Dexrazoxane undergoes intracellular hydrolysis first to its two one-ring open intermediates (B and C) and then to the two-ring opened form (ADR-925) which has a structure similar to EDTA and is a strong chelator of iron and divalent cations as calcium ions.