N.N.N.O=P(O)(OC[C@H]1O[C@@H](n2cnc3cncnc32)[C@H](O)[C@@H]1O)OP(=O)(O)OP(=O)(O)OP(=O)(O)OC[C@H]1O[C@@H](n2cnc3cncnc32)[C@H](O)[C@@H]1O
Please calculate the molecule's mass based on standard atomic weight.