Fig. 4. Identification of prodigiosin (2) from the FC resin bound fraction of the Xestospongia testudinaria X0192 fraction. (a) A 1H NMR spectrum (500 MHz) of the X. testudinaria fraction in CDCl3. (inset) Expanded region showing the NMR spectrum from 2 (blue) as compared to the X0192 fraction (black). (b) A 1H NMR spectrum (600 MHz) collected from the FC resin fraction containing 2 in 35 μL of CDCl3. Peaks from 2 are assigned numerically.
