| abstract |
A compound of formula I: n n n wherein X 1 , X 2 , X 3 , X 4 , Y 1 , Y 2 , Y 3 , Y 4 and Z have meanings given in the description, and metallated forms of such compounds, which are useful in the treatment of medical conditions for which a photodynamic compound is indicated. Pharmaceutical formulations and methods of treatment of a medical condition for which a photodynamic agent is indicated are also disclosed. Sterilising solutions comprising a compound of the invention, and the use thereof, are also disclosed. |