“…The sensitivity is 10 -25 times higher than those of the UV-HPLC methods. 15,16,19,25 Selectivity of the method Several drugs examined gave no fluorescent derivatives under the described conditions, even at a concentration of 5 µg ml -1 , i.e. heparin, diazepam, cyclophosphamide, 5-fluorouracil, melphalan, cytarabine, prednisolone, granisetron and morphine which are frequently coadministered with busulfan.…”