- 9-(2-Phosphonylmethoxyethyl)adenine (PMEA) effectively inhibits retrovirus replication in vitro and simian immunodeficiency virus infection in rhesus monkeys. Balzarini, J., Naesens, L., Slachmuylders, J., Niphuis, H., Rosenberg, I., Holý, A., Schellekens, H., De Clercq, E. AIDS (1991)