Atomic structure
There is only one chemically distinct structure:
Nc1nc2c(ncn2[C@@H]2O[C@H](COP(=O)(O)O[C@@H]3[C@@H](COP(=O)(O)O[C@@H]4[C@@H](COP(=O)(O)O[C@@H]5[C@@H](COP(=O)(O)O[C@@H]6[C@@H](COP(=O)(O)O[C@@H]7[C@@H](CO)O[C@@H](n8cnc9c(=O)[nH]c(N)nc98)[C@@H]7O)O[C@@H](n7cnc8c(=O)[nH]c(N)nc87)[C@@H]6O)O[C@@H](n6cnc7c(=O)[nH]c(N)nc76)[C@@H]5O)O[C@@H](n5cnc6c(=O)[nH]c(N)nc65)[C@@H]4O)O[C@@H](n4cnc5c(=O)[nH]c(N)nc54)[C@@H]3O)[C@@H](O)[C@H]2O)c(=O)[nH]1Warning = sub-repeat ending at xXP?: large unit count (11) was reduced to 5