This invention relates to Trans cyclopentanyl purine analogs of the formula (1) ##STR1## wherein the substituent in the 3-position on the cyclopentanyl ring is in the Trans configuration relative to the bicyclic substituent, Y.sub.3, Y.sub.5 and Y.sub.9 are each nitrogen and Y.sub.7 and Y.sub.8 are a CH group, R is a C.sub.1 -C.sub.7 alkyl acyl or aryl acyl, Q is NH.sub.2, halogen or hydrogen, Z is hydrogen, halogen, or NH.sub.2 ; or a pharmaceutically-acceptable salt thereof, and to their use as immunosuppressants.
                            本发明涉及公式(1)的Trans环戊酰基
嘌呤类似物
##STR1##
其中,环戊酰基上的3位取代基与双环取代基Y.sub.3,Y.sub.5和Y.sub.9相对处于Trans构型,Y.sub.7和Y.sub.8为CH基,R为C.sub.1-C.sub.7烷酰基或芳基酰基,Q为NH.sub.2,卤素或氢,Z为氢,卤素或NH.sub.2;或其药学上可接受的盐,并用作
免疫抑制剂。