Patent ID: 6878737

Claim:
A method for resensitizing S1-M1-3.2 multiple drug resistant cancer cells to treatment with a chemotherapeutic agent to which said cancer cells have developed resistance comprising administration of an effective amount of a chemosensitizing reversal agent selected from compounds of Formula (I) wherein: n is an integer of 0, 1, or 2; R 1 is hydrogen or alkoxy of 1 to 10 carbon atoms; R 2 is hydrogen or alkenyl of 2 to 10 carbon atoms; R 3 is hydrogen, alkyl of 1 to 10 carbon atoms, alkenyl of 2 to 10 carbon atoms, R 7 NH(CH2)v- or m is an integer of 1 to 6; v is an integer of 1 to 4; R 4 , R 5 and R 6 are hydrogen; R 7 is H or R 8 is selected from alkyl of 1 to 10 carbon atoms, —(CH 2 ) m CO 2 H, or a pharmaceutically acceptable salt thereof, Fumitremorgin A, Fumitremorgin B and Fumitremorgin C and a chemotherapeutic agent resistant to said cancer cells.