Suitable 4 2 piperazinones include 4 2 piperazinone, 4 1 methyl 2 piperazinone, {HEAD ~ 4 3 methyl 2 piperazinone}, 4 5 methyl 2 piperazinone, 3 ethyl 4 2 piperazinone, 3 ethyl 4 2 piperazinone, 6 ethyl 4 2 piperazinone, 4 5,6 dimethyl 2 piperazinone, 1 ethyl 4 2 piperazinone, 4 3 phenyl 2 piperazinone, 1,4 bis 2 piperazinone, 4 2 piperazinone, {TAIL ~ 4 2 piperazinone} and 4 6 methyl 2 piperazinone 
Suitable 4 2 piperazinones include 4 2 piperazinone , 4 1 methyl 2 piperazinone , { HEAD ~ 4 3 methyl 2 piperazinone } , 4 5 methyl 2 piperazinone , 3 ethyl 4 2 piperazinone , 3 ethyl 4 2 piperazinone , 6 ethyl 4 2 piperazinone , 4 5,6 dimethyl 2 piperazinone , 1 ethyl 4 2 piperazinone , 4 3 phenyl 2 piperazinone , 1,4 bis 2 piperazinone , 4 2 piperazinone , { TAIL ~ 4 2 piperazinone } and 4 6 methyl 2 piperazinone
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH