Wiktionary
acefluranol
n. A contrast agent used in ultrasound.
Wikipedia
Acefluranol
Acefluranol ( INN, BAN) (developmental code name BX-591), also known as 2,3-bis(3,4-diacetoxy-5-fluorophenyl)pentane, is a non-steroidal antiestrogen that was never marketed. It is a poly fluorinated biphenyl that is related to polybrominateds and polychlorinated biphenyls and diethylstilbestrol.