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  • Title: Indole derivatives from a marine sponge-derived yeast as DPPH radical scavengers.
    Author: Sugiyama Y, Ito Y, Suzuki M, Hirota A.
    Journal: J Nat Prod; 2009 Nov; 72(11):2069-71. PubMed ID: 19943625.
    Abstract:
    Two new indole derivatives (3, 4) and three known compounds (1, 2, 5) were isolated as radical scavengers from the culture filtrate of a marine sponge-derived yeast. Their structures were determined to be tyrosol (1), tryptophol (2), 2-(1H-indol-3-yl)ethyl 2-hydroxypropanoate (3), 2-(1H-indol-3-yl)ethyl 5-hydroxypentanoate (4), and cyclo(L-Pro-L-Tyr) (5) on the basis of their spectroscopic data. The absolute configurations of compounds 3 and 5 were determined by chiral HPLC analysis combined with synthesis and Marfey's method, respectively. Each obtained compound was evaluated for DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity, and all compounds exhibited weak activities.
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