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Atomic structure
There are 8 chemically distinct structures. Please, select:

CCCCCCCCCCCCCCCCCCCCCCCC(=O)O[1*]OP(=O)(O)O[C@@H]1[C@@H](O)[C@H](O)[C@@H](O)[C@H](O)[C@@H]1O[C@H]1O[C@H](CO)[C@@H](O)[C@H](O[C@H]2O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]2O[C@H]2O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]2O)[C@@H]1OR1 = xXphSph (phSphC18 or phSphC20)