Guaianolides from Curcuma kwangsiensis

A new (1) and two rare guaianolides (2 and 3) were isolated from the rhizomes of Curcuma kwangsiensis S.G. Lee and C.F. Liang (Zingiberaceae). The absolute configurations of 1 and the previously isolated 2 were unambiguously determined by using CD spectroscopic data.