The present invention relates to optionally substituted {TAIL ~ pyridopyrimidine 2,4 diones} or optionally substituted pyridopyrimidine 2 ones, i.e., compounds of Formula I: ##STR1## wherein: {HEAD ~ Y} is CH2 or C  
The present invention relates to optionally substituted { TAIL ~ pyridopyrimidine 2,4 diones } or optionally substituted pyridopyrimidine 2 ones , i.e. , compounds of Formula I : # # STR1 # # wherein : { HEAD ~ Y } is CH2 or C
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH