Saturated heterocyclic rings

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GDBB43 GDBB31  GDBB46 GDBB104
 GDBB150  GDBB269  GDBB102  GDBB107
 GDBB103  GDBB153  GDBB155  GDBB156
GDBB157 GDBB158 GDBB105 GDBB151
GDBB252 GDBB160  GDBB161
 
 GDBB202 GDBB186  GDBB251 GDBB159-2
GDBB253 GDBB254 GDBB255 GDBB256
 GDBB257  GDBB294  GDBB293  GDBB292