2’-Monodehydroxy-2’-chloro-d5 Ganciclovir is an labelled Impurity of Ganciclovir (G235000). 2’-Monodehydroxy-2’-chloro Ganciclovir is a sugar modified acyclic analogue. Studies have shown 2’-Monodehydroxy-2’-chloro Ganciclovir has potential to exhibit virucidal activity.