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Atomic structure
There is only one chemically distinct structure:
CCCCCCCCCCCCCCCCC(O)C(=O)O[1*]O[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1OR1 = xXSphd (9-methyl-(2R,3S,4E,8E)-4,8-sphingadienine-C18 (atypical 2R,3S-stereomer))