Impurity of Doxercalciferol n C sodium C[C@]12CC[C@H]3[C@@H](CC[C@H]4C[C@H](OC(C)=O)[C@H](C[C@@]43C)N3CCCCC3)[C@@H]1C[C@@H]([C@@H]2OC(C)=O)[N+]1(C)CCCCC1
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