| 摘要 |
A compound having the formula <IMAGE> (1) in which X is O, S, or Se; each R1, R2, and R3, independently, is H, a lower alkyl, or aralkyl; A is a saturated or unsaturated ring; and each Z1, Z2, Z3, Z4, Z5, Z6, Z7, or Z8, independently, is H or a halogen, provided that when X is O, at least one group Z is a halogen; when either Z2 or Z3 is a halogen, at least one of R2 or R3 is H; and when both Z2 and Z3 are halogens, both R2 and R3 are H; or a pharmaceutically acceptable salt thereof. The compounds are useful for photo-inactivation of cancer cells.
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