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Cyclo-(l-tryptophyl-l-phenylalanyl) was isolated from an unidentified Penicillium sp. The absolute configuration of the compound was confirmed to be S,S at C-11 and C-14 by means of the comparison of the CD spectrum with that of the synthetic compound synthesized from l-tryptophan andl -phenylalanine. Cyclo-(l-try-l-Phe) and its components, l-tryptophan and l-phenylalanine, exhibited different biological...