Two new triterpene glycosides from Stichopus variegatus Two new triterpene glycosides from sea cucumber Holothuria nobilis Studies on antitumor activities of triterpene glycoside colochiroside A from sea cucumber Colochirus anceps Extraction, isolation, and structure elucidation of two new triterpene glycosides from sea cucumber Holothuria nobilis Triterpene Glycosides in the Leaves of Acanthopanax giraldii Two new triterpene glycosides from Stichopus variegatus