The story
Probably from (ben)z(oth)i(ophene) + leu(ko)t(riene) + -on.
Etymology from Wiktionary, CC BY-SA 4.0.
zileuton
Today it means: An asthma drug that blocks leukotriene synthesis by inhibiting 5-lipoxygenase, an enzyme of the eicosanoid synthesis pathway. Full definition →