8748
Busulfan ( Bu ) and cyclophosphamide ( Cy ) are the most commonly used alkylators in high - dose pretransplant conditioning for HSCT ; a treatment that is correlated with drug - related toxicity and relapse .
 Chemical: Busulfan; Chemical: cyclophosphamide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Busulfan; Chemical: cyclophosphamide