Triterpene glycosides from Antarctic sea cucumbers. 2. Structure of Achlioniceosides A1, A2, and A3 from the Sea Cucumber Achlionice violaecuspidata (= Rhipidothuria racowitzai) - Antonov, A S; Avilov, S A; Kalinovsky, A I; Anastyuk, S D; Dmitrenok, P D; Kalinin, V I; Taboada, S; Bosch, A; Avila, C; Stonik, V A (J Nat Prod, 2009)