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A new iridoid named (1R,6S,8R,9R) -1 -ethoxy-8-methyl-1,5,6,7,8,9-hexahydrocyclopenta[c] pyran-4-carbaldehyde (1) was isolated from the Tibetan folk medicine Incarvillea younghusbandii Sprague. Its structure was elucidated by spectral methods,e, g. ID and 2D NMR and HRMS.