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. 2016 Mar 10;21(3):331. doi: 10.3390/molecules21030331

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© 2016 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Chemical structures of various biological active constituents from E. longifolia; (A) 7-Methoxy-beta-carboline-1-propionic acid (C15); (B) 9-methoxycanthin-6-one (C15); (C) Laurycolactone (C17); (D) Eurycolactone B (C18); (E) Eurycomalide A (C19); (F) Eurylactone (C19); (G) Longilactone (C19); (H) Eurycomalactone (C19); (I) Eurycomanone (C20); (J) Eurycomanol (C20); (K) Pasakbumin B (C20); (L) Hydroxyklaineanone (C20); (M) Biphenyl-neolignan (C21); (N) Quassin (C22, basic ring of quassinoids); (O) Niloticin (C30); and (P) Eurylene (C34).