23753
PURPOSE : To build a population pharmacokinetic ( PK ) model of cyclophosphamide ( CY ) and its metabolite , 4 - hydroxycyclophosphamide ( HCY ) , in patients undergoing allogeneic haematopoietic stem cell transplantation ( HSCT ) and to identify covariates , including genetic polymorphisms , which affect CY and HCY PK parameters .
 Chemical: cyclophosphamide; Chemical: 4 - hydroxycyclophosphamide; Chemical: HCY; Chemical: HCY
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: cyclophosphamide; Chemical: 4 - hydroxycyclophosphamide; Chemical: HCY; Chemical: HCY