Ganciclovir is considered a potential human carcinogen, teratogen, and mutagen. Gallic acid is classified as a mutagen and a teratogen. It is thus considered as a potent carcinogen, mutagen, and teratogen. "N"-Nitroso-"N"-methylurea (NMU) is a highly reliable carcinogen, mutagen, and teratogen. Thalidomide is a teratogen and caused horrific birth abnormalities. Jervine is a potent teratogen causing birth defects in vertebrates. Isotretinoin is a teratogen with a number of potential side-effects. Raloxifene is a teratogen; i.e., it can cause developmental abnormalities such as birth defects. Thymidine is listed as a chemical teratogen. DES has been marked as a teratogen as it results in malformation of the embryo. Potassium iodide is a possible teratogen. Warfarin is a teratogen which can cross from the mother to the developing fetus. Lithium is a teratogen, causing birth defects in a small number of newborn babies. Alcohol is known to act as a teratogen. It is classified as a teratogen on the Hazardous Substance List, already in 1986.