Table 20. Chemical Structures of Compounds 68a–r and 69a–f.

compd	n	R1	R2	R3	R4	compd	n	R1	R2	R3	R4
68a		H	Cl	H	H	68m		OEt	F	H	H
68b		H	H	Cl	H	68n		OEt	H	F	H
68c		H	H	H	Cl	68o		OEt	H	H	F
68d		H	F	H	H	68p		OEt	Cl	H	Cl
68e		H	H	F	H	68q		OEt	H	Cl	Cl
68f		H	H	H	F	68r		OEt	H	H	NO2
68g		H	Cl	H	Cl	69a	4	H
68h		H	H	Cl	Cl	69b	5	H
68i		H	H	H	NO2	69c	6	H
68j		OEt	Cl	H	H	69d	4	OEt
68k		OEt	H	Cl	H	69e	5	OEt
68l		OEt	H	H	Cl	69f	6	OEt