FIELD OF THE INVENTION
Described herein are polymorphic forms of 1,6-dibromo-1,6-dideoxy-dulcitol (dibromo dulcitol or DBD), which is a known antitumor agent. Also described are methods of making these new crystalline polymorphic forms as well as methods of using these polymorphic forms to treat
The invention relates to new hexitols having the formulae (I) and (II), ##STR3## wherein the hexitol skeleton is dulcitol, mannitol or iditol,
X represents halogen, preferably bromine,
R is a saturated or unsaturated C.sub.4-10 alkylcarbonyl group which also contains a free carboxy group,