The elimination half-time for n-butyl alcohol (1–1.2 minutes) was also short. 20 minutes after the administration of n-butyl acetate no more n-butyl alcohol could be detected (CMA 1997). In an earlier study, 4-hydroxy-3-methoxymandelic acid was shown to be the main metabolite in the urine of mammals (no other details). It was shown later, however, that this substance is excreted with the urine also under normal or pathological conditions, which is the reason it is not clear whether 4-hydroxy-3-methoxymandelic acid is a true butyl acetate metabolite (ACGIH 1997, ECB 1995).