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Panel A shows the base peak chromatogram for sampling a fungal culture by droplet probe. Panel B shows the XIC of m/z 381.1099 (± 5 ppm), where the boxed retention times corresponded to resorcylic acid lactones 1 and 2, respectively, and the peak at 3.46 min represents a possible regioisomer of those compounds. Without chromatographic separation afforded by the droplet probe, the variance of the relative amounts of all three compounds would not be discernible. Adapted from Sica et al.39
