both of the pretreatments produced very similar decreases in drug responsiveness to all of the doxorubicin derivatives tested ( 4'-deoxydoxorubicin , 4'-o-methyldoxorubicin , 4'-epidoxorubicin , 4-demethoxydoxorubicin , and n-trifluoroacetyldoxorubicin-14-valeriate ) .
C0013089
doxorubicin
C0014582
4