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Structures of Lappaphen-a and Lappaphen-b, new guaianolides linked with a sulfur-containing acetylenic compound, from Arctium lappa LWASHINO, T; KOBAYASHI, H; IKAWA, Y et al.Agricultural and biological chemistry. 1987, Vol 51, Num 6, pp 1475-1480, issn 0002-1369Article

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