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Incorporation of an algal growth promoter into roseobacticide B. Shown is the gHSQC spectrum of 5 isolated from P. inhibens cultures containing compound 8. A single correlation is observed corresponding to 13C insertion at the C8 position of roseobacticide B. As expected, a C–H coupling constant of 159 Hz is observed at C8. Labeled roseobacticide B is shown along with the assigned shifts in the 1H trace.
