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