{HEAD ~ 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: Y is CH2 or C  
relates to optionally substituted
{ HEAD ~ 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 : Y is CH2 or C
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL 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 OTH OTH OTH OTH OTH OTH