abstract |
A compound of Formula I for use in the treatment of cancer: ** Formula ** wherein R1, R2, R3 and R4 are each independently H, COCH3, COCH2CH3 or COCH2CH2CH3; R5 and R6 are each, independently, H or F (18F or 19F); and at least one of R1, R2, R3 and R4 is COCH3, COCH2CH3 or COCH2CH2CH3. |