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Secondary metabolites of endophytic Guignardia mangiferae from Smilax glabra and their antitumor activities Studies on Steroidal Constituents from Saussurea gossypiphora D. Don Chemical constituents from Pteris deltodon Chemical constituents from Dianthus superbus Secondary metabolites of endophytic Guignardia mangiferae from Smilax glabra and their antitumor activities A new sesquiterpene from Dendrobium nobile