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The proposed structure in 1995 for zerumin need be revised on the basis of the original reported NMR data.

Reference:

[1] Hong-Xi Xu, Dong Hui, Keng-Yeow Sim. The isolation of a new labdane diterpene from the seeds of Alpinia zerumbet. Nat. Prod. Lett., 1995, 7(1): 29-34.