Atomic structure
There is only one chemically distinct structure:
Nc1nc2c(ncn2[C@H]2C[C@H](O)[C@@H](COP(=O)(O)O[C@H]3C[C@H](n4cnc5c(=O)[nH]c(N)nc54)O[C@@H]3COP(=O)(O)O[C@H]3C[C@H](n4cnc5c(=O)[nH]c(N)nc54)O[C@@H]3COP(=O)(O)O[C@H]3C[C@H](n4cnc5c(=O)[nH]c(N)nc54)O[C@@H]3COP(=O)(O)O[C@H]3C[C@H](n4cnc5c(=O)[nH]c(N)nc54)O[C@@H]3COP(=O)(O)O[C@H]3C[C@H](n4cnc5c(=O)[nH]c(N)nc54)O[C@@H]3CO)O2)c(=O)[nH]1Warning = sub-repeat ending at xXP?: large unit count (19) was reduced to 5