“…The absolute configuration of 4 was proposed to be same as 2). The structures of 2, 3, 5-10 were determined as thymine [15], cyclo-(dehydroAla-L-Val) [16,17], cyclo-(dehydroAla-L-Leu) [18], cyclo-(dehydroAla-L-Phe) [19], cyclo-(L-Val-L-Phe) [20], cyclo-(L-Leu-L-Phe) [20], cyclo-(L-Trp-L-Ile) [21] and cyclo-(L-Trp-L-Phe) [22], respectively, by comparing their NMR and specific OR data (Table 2) with those in the literature. All the isolated compounds were evaluated for their antibacterial activities against a panel of bacteria, including four pathogenic bacteria, E. coli, S. aureus, P. aeruginosa and B. subtilis, and nine marine fouling bacteria, P. fulva, A. hydrophila, A. salmonicida, V. anguillarum, V. harveyi, P. halotolerans, P. angustum, E. cloacae and E. hormaechei, and cytotoxic activities against five human cancer cell lines A549, PANC-1, HCT116, HepG2 and MDA-MB-231.…”