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Two new labdane diterpenes isolated from the rhizomes of Hedychium forrestii were determined by spectroscopic evidence to be labda-8(17), 11, 13-trien-7β-hydroxyl-15(16)-olide (1, hedyforrestin B) and labda-8(17), 11, 13-trien-7β,16-dihydroxyl-16(15)-olid