1. Institute for Chemistry and Biochemistry Freie University Berlin Takustr. 3 Berlin 14195 Germany
2. Department of Chemistry TDL Govt. College for Women Murthal 131027 Sonipat, Haryana India
3. Wellman Center for Photomedicine Massachusetts General Hospital Harvard Medical School Boston MA 02129 USA
4. Bioorganic Laboratory Department of Chemistry University of Delhi Delhi 110007 India