In the above embodiment of formula [I-3], R15 may be selected from the following: a ???H group; a ???OH group; a ???NO2 group; or a group selected from the following: In the above embodiment of formula [I-3], R16 may be selected from the following: In the above embodiment of formula [I-3], R17, which occurs one or more times and which may be the same of different in each occurrence, is a chlorine