Atomic structure
There is only one chemically distinct structure:
Cc1cn([C@@H]2O[C@H](COP(=O)(O)O[C@@H]3[C@@H](COP(=O)(O)O[C@@H]4[C@@H](CO)O[C@@H](n5ccc(N)nc5=O)[C@@H]4O)O[C@@H](n4ccc(N)nc4=O)[C@@H]3O)[C@@H](OP(=O)(O)OC[C@H]3O[C@@H](n4cc(C)c(=O)[nH]c4=O)[C@H](O)[C@@H]3OP(=O)(O)OC[C@H]3O[C@@H](n4cc(C)c(=O)[nH]c4=O)[C@H](O)[C@@H]3OP(=O)(O)OC[C@H]3O[C@@H](n4ccc(N)nc4=O)[C@H](O)[C@@H]3O)[C@H]2O)c(=O)[nH]c1=O