R1 is {TAIL ~ fluorine}, chlorine, {HEAD ~ iodine}, o bromo, m bromo, lower alkoxy, acyloxy, nitro, hydroxy, amino, lower alkylamino, di lower alkylamino 
R1 is { TAIL ~ fluorine } , chlorine , { HEAD ~ iodine } , o bromo , m bromo , lower alkoxy , acyloxy , nitro , hydroxy , amino , lower alkylamino , di lower alkylamino
OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH