*3.6. Isolation and Structure Identification of 6-epi-Monanchorin*

After incubation, the cells and culture broth of *Vibrio* sp. (strain CB1-14) were separated by centrifugation at 5000 rpm for 30 min. The cells were suspended in water (50 mL), frozen, and, after de-freezing, subjected to ultrasonic treatment. Then the suspension was extracted with EtOAc, and the organic phase was evaporated to dryness. Further chromatographic purification of the obtained residue with reversed-phase HPLC (YMC-ODS-A, 250 × 10 mm) using EtOH-H2O (55:45% + 0.05% TFA) gave pure compound **2**.

**6-***epi***-monanchorin** (**2**, 0.2 mg), HRESI MS *m*/*z* 212.1757 [M + H]<sup>+</sup> (calcd for C11H22N3O, 212.1757). 1H NMR (700 MHz, CDCl3): 8.74 (1H, br.s, H-2), 8.64 (1H, br.s, H-4), 7.08 (2H, br.s, H-10), 4.84 (1H, t, *J* = 3.0 Hz, H-1), 3.90 (1H, ddd, *J* = 6.0, 1.6, 7.6 Hz, H-6), 3.33 (1H, dt, *J* = 6.0, 1.6 Hz, H-5), 2.36 (1H, m, H-9a), 2.24 (2H, m, H-8), 2.13 (1H, m, H-9b), 1.74 (1H, m, H-11a), 1.52 (1H, m, H-11b), 1.40 (1H, m, H- H-12a), 1.30 (5H, m, H-12b and H2-13 and H2-14), 0.89 (3H, t, *J* = 6.7 Hz, H3-15).
