- 2-Acetylpyridine 5-[(dimethylamino)thiocarbonyl]-thiocarbonohydrazone (A1110U), a potent inactivator of ribonucleotide reductases of herpes simplex and varicella-zoster viruses and a potentiator of acyclovir. Spector, T., Harrington, J.A., Morrison, R.W., Lambe, C.U., Nelson, D.J., Averett, D.R., Biron, K., Furman, P.A. Proc. Natl. Acad. Sci. U.S.A. (1989)