2’-Monodehydroxy-2’-chloro Ganciclovir is an Impurity of Ganciclovir. 2’-Monodehydroxy-2’-chloro Ganciclovir is a sugar modified acyclic analogue of guanosine. Studies have shown 2’-Monodehydroxy-2’-chloro Ganciclovir has potential to exhibit virucidal activity.